diff --git a/diffly/cli.py b/diffly/cli.py
index 7177e58..b1b7148 100644
--- a/diffly/cli.py
+++ b/diffly/cli.py
@@ -12,18 +12,11 @@
 
 from ._compat import typer
 from ._utils import ABS_TOL_DEFAULT, ABS_TOL_TEMPORAL_DEFAULT, REL_TOL_DEFAULT
-from .metrics import Metric, MetricFn
 from .metrics.change import DEFAULT_CHANGE_METRICS
 from .metrics.data import DEFAULT_DATA_METRICS
 
 app = typer.Typer()
 
-#: All metric presets selectable via ``--metric``, combining the change and data sets.
-AVAILABLE_METRICS: dict[str, MetricFn | Metric] = {
-    **DEFAULT_CHANGE_METRICS,
-    **DEFAULT_DATA_METRICS,
-}
-
 
 @app.command()
 def main(
@@ -143,12 +136,21 @@ def main(
         list[str],
         typer.Option(hidden=True),
     ] = [],
-    metric: Annotated[
+    data_metric: Annotated[
         list[str],
         typer.Option(
             help=(
-                "Metric presets to display per column. Repeatable. "
-                f"Available: {', '.join(AVAILABLE_METRICS)}."
+                "Data metric presets to display in the Data Inspection section. "
+                f"Repeatable. Available: {', '.join(DEFAULT_DATA_METRICS)}."
+            )
+        ),
+    ] = [],
+    change_metric: Annotated[
+        list[str],
+        typer.Option(
+            help=(
+                "Change metric presets to display as extra columns in the Columns "
+                f"table. Repeatable. Available: {', '.join(DEFAULT_CHANGE_METRICS)}."
             )
         ),
     ] = [],
@@ -161,12 +163,20 @@ def main(
         )
         hidden_column = [*hidden_column, *hidden_columns]
 
-    for name in metric:
-        if name not in AVAILABLE_METRICS:
+    for name in data_metric:
+        if name not in DEFAULT_DATA_METRICS:
+            raise typer.BadParameter(
+                f"Unknown data metric: {name!r}. "
+                f"Available: {', '.join(DEFAULT_DATA_METRICS)}."
+            )
+    for name in change_metric:
+        if name not in DEFAULT_CHANGE_METRICS:
             raise typer.BadParameter(
-                f"Unknown metric: {name!r}. Available: {', '.join(AVAILABLE_METRICS)}."
+                f"Unknown change metric: {name!r}. "
+                f"Available: {', '.join(DEFAULT_CHANGE_METRICS)}."
             )
-    metrics = {name: AVAILABLE_METRICS[name] for name in metric}
+    data_metrics = {name: DEFAULT_DATA_METRICS[name] for name in data_metric}
+    change_metrics = {name: DEFAULT_CHANGE_METRICS[name] for name in change_metric}
 
     comparison = compare_frames(
         pl.scan_parquet(left),
@@ -185,7 +195,8 @@ def main(
         right_name=right_name,
         slim=slim,
         hidden_columns=hidden_column,
-        metrics=metrics,
+        data_metrics=data_metrics,
+        change_metrics=change_metrics,
     )
     if output_json:
         typer.echo(summary.to_json())
diff --git a/diffly/comparison.py b/diffly/comparison.py
index 6976b9c..28e36f0 100644
--- a/diffly/comparison.py
+++ b/diffly/comparison.py
@@ -25,7 +25,8 @@
     lazy_len,
     make_and_validate_mapping,
 )
-from .metrics import Metric, MetricFn, _make_numeric_metric
+from .metrics.change import ChangeMetric, ChangeMetricFn
+from .metrics.data import DataMetric, DataMetricFn
 
 if TYPE_CHECKING:  # pragma: no cover
     # NOTE: We cannot import at runtime as we're otherwise running into circular
@@ -920,7 +921,8 @@ def summary(
         right_name: str = Side.RIGHT,
         slim: bool = False,
         hidden_columns: list[str] | None = None,
-        metrics: Mapping[str, MetricFn | Metric] | None = None,
+        data_metrics: Mapping[str, DataMetricFn | DataMetric] | None = None,
+        change_metrics: Mapping[str, ChangeMetricFn | ChangeMetric] | None = None,
     ) -> Summary:
         """Generate a summary of all aspects of the comparison.
 
@@ -950,18 +952,30 @@ def summary(
                 advanced users who are familiar with the summary format.
             hidden_columns: Columns for which no values are printed, e.g. because they
                 contain sensitive information.
-            metrics: Optional mapping from display label to a metric. A value may be a
-                callable ``(left_expr, right_expr) -> pl.Expr`` or a
-                :class:`~diffly.metrics.Metric`. Each callable receives two
-                :class:`polars.Expr` referring to the left and right values of a single
-                column across all joined rows, and must return a scalar aggregation
-                expression. Bare callables are only computed for numerical columns; wrap
-                one in a :class:`~diffly.metrics.Metric` with a column selector to target
-                other column types (e.g. ``Metric(fn, selector=cs.all())``).
-                See :doc:`/api/metrics` for the full list of presets and the
-                :data:`~diffly.metrics.MetricFn` type. When ``None`` (default), no metrics
-                are computed; presets are not applied automatically. Prefer short labels —
-                the summary has a fixed width and many or long labels degrade rendering.
+            data_metrics: Optional mapping from display label to a data metric,
+                describing each dataset individually and rendered in the "Data
+                Inspection" section. A value may be a
+                :class:`~diffly.metrics.data.DataMetric` or a bare callable taking a
+                single column expression, which is wrapped in a
+                :class:`~diffly.metrics.data.DataMetric` applying to all columns. To
+                target other column types, construct the metric explicitly with a
+                column selector (e.g. ``DataMetric(fn, selector=cs.numeric())``).
+                See :doc:`/api/metrics` for the full list of presets. When ``None``
+                (default), no metrics are computed; presets are not applied
+                automatically. Prefer short labels — the summary has a fixed width and
+                many or long labels degrade rendering.
+            change_metrics: Optional mapping from display label to a change metric,
+                quantifying the change between the two sides and rendered as extra
+                columns in the "Columns" table. A value may be a
+                :class:`~diffly.metrics.change.ChangeMetric` or a bare callable taking a
+                pair of column expressions, which is wrapped in a
+                :class:`~diffly.metrics.change.ChangeMetric` applying to numerical
+                columns. To target other column types, construct the metric explicitly
+                with a column selector (e.g. ``ChangeMetric(fn, selector=cs.numeric())``).
+                See :doc:`/api/metrics` for the full list of presets. When ``None``
+                (default), no metrics are computed; presets are not applied
+                automatically. Prefer short labels — the summary has a fixed width and
+                many or long labels degrade rendering.
 
         Returns:
             A summary which can be printed or written to a file.
@@ -977,12 +991,14 @@ def summary(
         # NOTE: We're importing here to prevent circular imports
         from .summary import Summary
 
-        resolved_metrics = (
-            {
-                label: v if isinstance(v, Metric) else _make_numeric_metric(v)
-                for label, v in metrics.items()
-            }
-            if metrics is not None
+        resolved_data_metrics = (
+            {label: _resolve_data_metric(v) for label, v in data_metrics.items()}
+            if data_metrics is not None
+            else None
+        )
+        resolved_change_metrics = (
+            {label: _resolve_change_metric(v) for label, v in change_metrics.items()}
+            if change_metrics is not None
             else None
         )
 
@@ -996,7 +1012,8 @@ def summary(
             right_name=right_name,
             slim=slim,
             hidden_columns=hidden_columns,
-            metrics=resolved_metrics,
+            data_metrics=resolved_data_metrics,
+            change_metrics=resolved_change_metrics,
         )
 
     # ----------------------------------- UTILITIES ----------------------------------- #
@@ -1239,3 +1256,11 @@ def _list_length_exprs(
             for e in _list_length_exprs(expr.struct[field.name], field.dtype)
         ]
     return []
+
+
+def _resolve_data_metric(v: DataMetricFn | DataMetric) -> DataMetric:
+    return v if isinstance(v, DataMetric) else DataMetric(fn=v)
+
+
+def _resolve_change_metric(v: ChangeMetricFn | ChangeMetric) -> ChangeMetric:
+    return v if isinstance(v, ChangeMetric) else ChangeMetric(fn=v)
diff --git a/diffly/metrics/__init__.py b/diffly/metrics/__init__.py
index a3a165b..df5359a 100644
--- a/diffly/metrics/__init__.py
+++ b/diffly/metrics/__init__.py
@@ -1,50 +1,17 @@
 # Copyright (c) QuantCo 2025-2026
 # SPDX-License-Identifier: BSD-3-Clause
-
 """Metrics computed per column when generating a summary.
 
 Two families are provided:
 
-- Metrics in :mod:`~diffly.metrics.change` describe the change between numeric
-  columns itself by aggregating over ``right - left``.
-- Metrics in :mod:`~diffly.metrics.data` describe the left and right datasets
-  individually, explaining how a change affects the data.
+- :class:`~diffly.metrics.change.ChangeMetric`s in :mod:`~diffly.metrics.change` describe the change between
+  columns itself by aggregating over a combination of the columns (e.g., ``right - left``).
+- :class:`~diffly.metrics.data.DataMetric`s in :mod:`~diffly.metrics.data` describe the left and right
+  datasets individually, explaining how a change affects the data.
 """
 
 from __future__ import annotations
 
 from . import change, data
-from ._common import Metric, MetricFn
-from .change import (
-    _make_numeric_metric,
-    max,
-    mean,
-    mean_absolute_deviation,
-    mean_relative_deviation,
-    median,
-    min,
-    quantile,
-    std,
-)
-
-DEFAULT_METRICS: dict[str, MetricFn | Metric] = {
-    **change.DEFAULT_CHANGE_METRICS,
-}
-"""The default preset metrics, consisting of the change default set."""
 
-__all__ = [
-    "DEFAULT_METRICS",
-    "Metric",
-    "MetricFn",
-    "change",
-    "data",
-    "max",
-    "mean",
-    "mean_absolute_deviation",
-    "mean_relative_deviation",
-    "median",
-    "min",
-    "quantile",
-    "std",
-    "_make_numeric_metric",
-]
+__all__ = ["change", "data"]
diff --git a/diffly/metrics/_common.py b/diffly/metrics/_common.py
deleted file mode 100644
index 5ba7c38..0000000
--- a/diffly/metrics/_common.py
+++ /dev/null
@@ -1,27 +0,0 @@
-# Copyright (c) QuantCo 2025-2026
-# SPDX-License-Identifier: BSD-3-Clause
-
-from __future__ import annotations
-
-from collections.abc import Callable
-from dataclasses import dataclass
-
-import polars as pl
-import polars.selectors as cs
-
-
-@dataclass(frozen=True)
-class Metric:
-    """A metric function paired with a column-applicability selector."""
-
-    fn: MetricFn
-    selector: cs.Selector
-
-
-MetricFn = Callable[[pl.Expr, pl.Expr], pl.Expr]
-"""A metric function maps ``(left_expr, right_expr)`` to a scalar aggregation
-expression.
-
-The expressions refer to the left-side and right-side values of a single column across
-all joined rows.
-"""
diff --git a/diffly/metrics/change.py b/diffly/metrics/change.py
index f4965f1..0fa46d8 100644
--- a/diffly/metrics/change.py
+++ b/diffly/metrics/change.py
@@ -1,21 +1,37 @@
 # Copyright (c) QuantCo 2025-2026
 # SPDX-License-Identifier: BSD-3-Clause
 
-"""Metrics describing the change between numeric columns.
-
-These aggregate over ``right - left`` to characterize the change itself.
-"""
-
 from __future__ import annotations
 
+from collections.abc import Callable
+from dataclasses import dataclass, field
+
 import polars as pl
 import polars.selectors as cs
 
-from ._common import Metric, MetricFn
+ChangeMetricFn = Callable[[pl.Expr, pl.Expr], pl.Expr]
+"""A `ChangeMetricFn` maps a pair of column expressions to a scalar aggregation
+expression."""
+
+
+@dataclass(frozen=True)
+class ChangeMetric:
+    """A metric quantifying the *change* in a column between the two sides of a
+    comparison.
+
+    Change metrics are rendered as extra columns in the "Columns" table, alongside the
+    match rate.
+    """
+
+    fn: ChangeMetricFn
+    """Aggregates over ``right - left`` (e.g. the mean delta) to describe the change
+    itself."""
+
+    selector: cs.Selector = field(default_factory=cs.numeric)
+    """Selects the columns the metric applies to; defaults to numeric columns."""
 
 
-def _make_numeric_metric(fn: MetricFn) -> Metric:
-    return Metric(fn=fn, selector=cs.numeric())
+# ---------------------------------- CHANGE METRICS ---------------------------------- #
 
 
 def mean(left: pl.Expr, right: pl.Expr) -> pl.Expr:
@@ -54,7 +70,7 @@ def mean_relative_deviation(left: pl.Expr, right: pl.Expr) -> pl.Expr:
     return ((right - left) / left).abs().mean()
 
 
-def quantile(q: float) -> MetricFn:
+def quantile(q: float) -> ChangeMetricFn:
     """Factory returning a metric that computes the ``q``-quantile of
     ``right - left``."""
     if not 0 <= q <= 1:
@@ -66,13 +82,13 @@ def _quantile(left: pl.Expr, right: pl.Expr) -> pl.Expr:
     return _quantile
 
 
-DEFAULT_CHANGE_METRICS: dict[str, MetricFn] = {
-    "Mean": mean,
-    "Median": median,
-    "Min": min,
-    "Max": max,
-    "Std": std,
-    "Mean absolute deviation": mean_absolute_deviation,
-    "Mean relative deviation": mean_relative_deviation,
+DEFAULT_CHANGE_METRICS: dict[str, ChangeMetric] = {
+    "Mean diff": ChangeMetric(fn=mean),
+    "Median diff": ChangeMetric(fn=median),
+    "Min diff": ChangeMetric(fn=min),
+    "Max diff": ChangeMetric(fn=max),
+    "Std diff": ChangeMetric(fn=std),
+    "Mean absolute diff": ChangeMetric(fn=mean_absolute_deviation),
+    "Mean relative diff": ChangeMetric(fn=mean_relative_deviation),
 }
 """Preset metrics describing the change between numeric columns."""
diff --git a/diffly/metrics/data.py b/diffly/metrics/data.py
index 066a06b..c3babd5 100644
--- a/diffly/metrics/data.py
+++ b/diffly/metrics/data.py
@@ -1,75 +1,60 @@
 # Copyright (c) QuantCo 2025-2026
 # SPDX-License-Identifier: BSD-3-Clause
 
-"""Metrics describing the left and right datasets individually.
-
-These characterize each side of a change so you can understand how the change affects
-the data, rather than describing the change itself.
-"""
-
 from __future__ import annotations
 
 from collections.abc import Callable
+from dataclasses import dataclass, field
+from typing import Any
 
 import polars as pl
 import polars.selectors as cs
 
-from ._common import Metric, MetricFn
+DataMetricFn = Callable[[pl.Expr], pl.Expr]
+"""A data metric maps a single column expression to a scalar aggregation expression."""
 
 
-def null_fraction_change(left: pl.Expr, right: pl.Expr) -> pl.Expr:
-    """Change in the fraction of null entries, rendered as ``<old> -> <new> (<delta>)``.
+@dataclass(frozen=True)
+class DataMetric:
+    """A metric describing each dataset *individually*.
 
-    ``old`` and ``new`` are the null percentages of the left and right side, and
-    ``delta`` is their signed difference (``+`` when the right side has proportionally
-    more nulls, ``-`` when it has fewer). This metric function can be applied to columns
-    of any type.
+    Data metrics are rendered in a dedicated "Data Inspection" section, showing the left
+    and right value side by side, followed by their signed delta for numeric values.
     """
-    return _render_change(
-        left.is_null().mean(),
-        right.is_null().mean(),
-        lambda value, signed: _percentage_string(
-            value, signed=signed, percent_sign=not signed
-        ),
-    )
 
+    fn: DataMetricFn
+    """Applied to the left and right side separately, characterizing the data rather
+    than the change between the sides."""
 
-DEFAULT_DATA_METRICS: dict[str, MetricFn | Metric] = {
-    "Null%": Metric(fn=null_fraction_change, selector=cs.all()),
-}
-"""Preset metrics describing the left and right datasets individually."""
+    selector: cs.Selector = field(default_factory=cs.all)
+    """Selects the columns the metric applies to; defaults to all columns."""
+
+    formatter: Callable[[Any], str] | None = None
+    """Formats a single left/right value for display.
+
+    Falls back to the default numeric precision when unset.
+    """
 
+    delta_formatter: Callable[[Any], str] | None = None
+    """Formats the magnitude of the delta, which is rendered with an explicit sign.
 
-# ------------------------------------------------------------------------------------ #
-#                                    UTILITY METHODS                                   #
-# ------------------------------------------------------------------------------------ #
+    Falls back to ``formatter`` when ``None``.
+    """
 
 
-def _percentage_string(
-    fraction: pl.Expr, *, signed: bool = False, percent_sign: bool = True
-) -> pl.Expr:
-    """Format a fraction as a percentage string, optionally with an explicit sign."""
-    pct = (fraction * 100).round(2)
-    body = pl.format("{}%", pct) if percent_sign else pl.format("{}", pct)
-    if signed:
-        return pl.when(pct >= 0).then(pl.format("+{}", body)).otherwise(body)
-    return body
+# ----------------------------------- DATA METRICS ----------------------------------- #
 
 
-def _render_change(
-    old: pl.Expr,
-    new: pl.Expr,
-    format_value: Callable[[pl.Expr, bool], pl.Expr],
-) -> pl.Expr:
-    """Render a change as ``<old> -> <new> (<delta>)``.
+def null_fraction(col: pl.Expr) -> pl.Expr:
+    """Fraction of null entries in a column."""
+    return col.is_null().mean()
 
-    ``format_value(value, signed)`` formats a value for display; ``old`` and ``new`` are
-    rendered unsigned and the delta ``new - old`` is rendered signed (with an explicit
-    ``+`` prefix for positive values).
-    """
-    return pl.format(
-        "{} -> {} ({})",
-        format_value(old, False),
-        format_value(new, False),
-        format_value(new - old, True),
-    )
+
+DEFAULT_DATA_METRICS: dict[str, DataMetric] = {
+    "Null%": DataMetric(
+        fn=null_fraction,
+        formatter=lambda value: f"{round(value * 100, 2)}%",
+        delta_formatter=lambda value: f"{round(value * 100, 2)}",
+    ),
+}
+"""Preset metrics describing the left and right datasets individually."""
diff --git a/diffly/summary.py b/diffly/summary.py
index ac3dda7..c96235e 100644
--- a/diffly/summary.py
+++ b/diffly/summary.py
@@ -6,7 +6,7 @@
 import dataclasses
 import io
 import json
-from collections.abc import Mapping
+from collections.abc import Callable, Mapping
 from dataclasses import dataclass
 from datetime import date, datetime, timedelta
 from decimal import Decimal
@@ -23,7 +23,8 @@
 from rich.text import Text
 
 from ._utils import Side, capitalize_first
-from .metrics import Metric
+from .metrics.change import ChangeMetric
+from .metrics.data import DataMetric
 
 if TYPE_CHECKING:  # pragma: no cover
     from .comparison import DataFrameComparison
@@ -61,7 +62,8 @@ def __init__(
         right_name: str,
         slim: bool,
         hidden_columns: list[str] | None,
-        metrics: Mapping[str, Metric] | None,
+        data_metrics: Mapping[str, DataMetric] | None,
+        change_metrics: Mapping[str, ChangeMetric] | None,
     ):
         self.slim = slim
         self._data = _compute_summary_data(
@@ -74,7 +76,8 @@ def __init__(
             right_name=right_name,
             slim=slim,
             hidden_columns=hidden_columns,
-            metrics=metrics,
+            data_metrics=data_metrics,
+            change_metrics=change_metrics,
         )
 
     def format(self, pretty: bool | None = None) -> str:
@@ -131,9 +134,11 @@ def to_json(self, **kwargs: Any) -> str:
                       "name": "value",
                       "match_rate": 0.667,
                       "n_total_changes": 1,
-                      "changes": [{"old": 1.0, "new": 2.0, "count": 1, "sample_pk": [1]}]
+                      "changes": [{"old": 1.0, "new": 2.0, "count": 1, "sample_pk": [1]}],
+                      "change_metrics": null
                     }
                   ],
+                  "data_inspection": null,
                   "sample_rows_left_only": [],
                   "sample_rows_right_only": []
                 }
@@ -179,6 +184,7 @@ def _print_diff(self, console: Console) -> None:
         self._print_schemas(console)
         self._print_rows(console)
         self._print_columns(console)
+        self._print_data_inspection(console)
         self._print_sample_rows_only_one_side(console, side=Side.LEFT)
         self._print_sample_rows_only_one_side(console, side=Side.RIGHT)
 
@@ -571,15 +577,14 @@ def _section_columns(self) -> RenderableType:
         elif not columns:
             display_items.append(Text("All columns match perfectly.", style="italic"))
         else:
-            metric_labels = self._data._metric_labels
-            matches = Table(show_header=bool(metric_labels))
+            matches = Table(show_header=bool(self._data._change_metric_labels))
             matches.add_column(
                 "Column",
                 max_width=COLUMN_SECTION_COLUMN_WIDTH,
                 overflow=OVERFLOW,
             )
             matches.add_column("Match Rate", justify="right")
-            for label in metric_labels:
+            for label in self._data._change_metric_labels:
                 matches.add_column(label, justify="right")
             has_top_changes_column = any(
                 c.changes is not None for c in columns if c.match_rate < 1
@@ -592,8 +597,10 @@ def _section_columns(self) -> RenderableType:
                     Text(col.name, style="cyan"),
                     f"{_format_fraction_as_percentage(col.match_rate)}",
                 ]
-                for label in metric_labels:
-                    value = col.metrics.get(label) if col.metrics else None
+                for label in self._data._change_metric_labels:
+                    value = (
+                        col.change_metrics.get(label) if col.change_metrics else None
+                    )
                     row_items.append(_format_metric_value(value))
                 if col.changes is not None:
                     change_lines = []
@@ -632,6 +639,41 @@ def _section_columns(self) -> RenderableType:
 
         return Group(*display_items)
 
+    # ------------------------------- DATA INSPECTION -------------------------------- #
+
+    def _print_data_inspection(self, console: Console) -> None:
+        if not self._data.data_inspection or not self._data._data_metrics:
+            return
+        _print_section(
+            console,
+            "Data Inspection",
+            self._section_data_inspection(),
+        )
+
+    def _section_data_inspection(self) -> RenderableType:
+        assert self._data.data_inspection is not None
+
+        table = Table()
+        table.add_column(
+            "Column",
+            max_width=COLUMN_SECTION_COLUMN_WIDTH,
+            overflow=OVERFLOW,
+        )
+        for label in self._data._data_metrics:
+            table.add_column(label, justify="right", overflow=OVERFLOW)
+        for col in self._data.data_inspection:
+            row_items: list[RenderableType] = [Text(col.name, style="cyan")]
+            for label in self._data._data_metrics:
+                result = col.data_metrics.get(label)
+                metric = self._data._data_metrics[label]
+                row_items.append(
+                    _format_data_metric_result(
+                        result, metric.formatter, metric.delta_formatter
+                    )
+                )
+            table.add_row(*row_items)
+        return table
+
     # ------------------------------ ROWS ONLY ONE SIDE ------------------------------ #
 
     def _print_sample_rows_only_one_side(self, console: Console, side: Side) -> None:
@@ -709,13 +751,27 @@ class SummaryDataColumnChange:
     sample_pk: tuple[Any, ...] | None
 
 
+@dataclass
+class DataMetricResult:
+    """A data metric evaluated on each side of the comparison."""
+
+    left: Any
+    right: Any
+
+
 @dataclass
 class SummaryDataColumn:
     name: str
     match_rate: float
     n_total_changes: int
     changes: list[SummaryDataColumnChange] | None
-    metrics: dict[str, Any] | None
+    change_metrics: dict[str, Any] | None
+
+
+@dataclass
+class SummaryDataInspectionColumn:
+    name: str
+    data_metrics: dict[str, DataMetricResult]
 
 
 @dataclass
@@ -727,13 +783,15 @@ class SummaryData:
     schemas: SummaryDataSchemas | None
     rows: SummaryDataRows | None
     columns: list[SummaryDataColumn] | None
+    data_inspection: list[SummaryDataInspectionColumn] | None
     sample_rows_left_only: list[tuple[Any, ...]] | None
     sample_rows_right_only: list[tuple[Any, ...]] | None
     _is_empty: bool
     _other_common_columns: list[str]
     _truncated_left_name: str
     _truncated_right_name: str
-    _metric_labels: list[str]
+    _change_metric_labels: list[str]
+    _data_metrics: dict[str, DataMetric]
 
     def to_dict(self) -> dict[str, Any]:
         def _convert(obj: Any) -> Any:
@@ -772,7 +830,8 @@ def _compute_summary_data(
     right_name: str,
     slim: bool,
     hidden_columns: list[str] | None,
-    metrics: Mapping[str, Metric] | None,
+    data_metrics: Mapping[str, DataMetric] | None,
+    change_metrics: Mapping[str, ChangeMetric] | None,
 ) -> SummaryData:
     from .comparison import DataFrameComparison
 
@@ -830,18 +889,21 @@ def _validate_primary_key_hidden_columns() -> None:
             schemas=None,
             rows=None,
             columns=None,
+            data_inspection=None,
             sample_rows_left_only=None,
             sample_rows_right_only=None,
             _is_empty=is_empty,
             _other_common_columns=comp._other_common_columns,
             _truncated_left_name=truncated_left,
             _truncated_right_name=truncated_right,
-            _metric_labels=[],
+            _change_metric_labels=[],
+            _data_metrics={},
         )
 
-    metrics_resolved: dict[str, Metric] = dict(metrics or {})
-    metrics_by_column = _compute_column_metrics(comp, metrics_resolved)
-    metric_labels = list(metrics_resolved.keys())
+    change_metrics = dict(change_metrics or {})
+    data_metrics = dict(data_metrics or {})
+    change_metrics_by_column = _compute_change_metrics(comp, change_metrics)
+    change_metric_labels = list(change_metrics)
 
     schemas = _compute_schemas(comp, slim)
     rows = _compute_rows(comp, slim)
@@ -851,8 +913,9 @@ def _validate_primary_key_hidden_columns() -> None:
         show_perfect_column_matches,
         top_k_changes_by_column,
         show_sample_primary_key_per_change,
-        metrics_by_column,
+        change_metrics_by_column,
     )
+    data_inspection = _compute_data_inspection(comp, data_metrics, hidden_columns)
     sample_rows_left_only, sample_rows_right_only = _compute_sample_rows(
         comp, sample_k_rows_only
     )
@@ -865,13 +928,15 @@ def _validate_primary_key_hidden_columns() -> None:
         schemas=schemas,
         rows=rows,
         columns=columns,
+        data_inspection=data_inspection,
         sample_rows_left_only=sample_rows_left_only,
         sample_rows_right_only=sample_rows_right_only,
         _is_empty=is_empty,
         _other_common_columns=comp._other_common_columns,
         _truncated_left_name=truncated_left,
         _truncated_right_name=truncated_right,
-        _metric_labels=metric_labels,
+        _change_metric_labels=change_metric_labels,
+        _data_metrics=data_metrics,
     )
 
 
@@ -933,28 +998,38 @@ def _compute_rows(comp: DataFrameComparison, slim: bool) -> SummaryDataRows | No
     )
 
 
-def _compute_column_metrics(
-    comp: DataFrameComparison,
-    metrics: Mapping[str, Metric],
-) -> dict[str, dict[str, Any]]:
-    if comp.primary_key is None or comp.num_rows_joined() == 0:
-        return {}
+def _select_metric_columns(
+    comp: DataFrameComparison, selector: cs.Selector
+) -> set[str]:
+    left = set(cs.expand_selector(comp.left_schema, selector))
+    right = set(cs.expand_selector(comp.right_schema, selector))
+    return (left & right) & set(comp._other_common_columns)
 
-    def select_columns(selector: cs.Selector) -> set[str]:
-        left = set(cs.expand_selector(comp.left_schema, selector))
-        right = set(cs.expand_selector(comp.right_schema, selector))
-        return (left & right) & set(comp._other_common_columns)
 
-    metric_to_columns = {
-        label: select_columns(m.selector) for label, m in metrics.items()
+def _metric_target_columns(
+    comp: DataFrameComparison, metrics: Mapping[str, ChangeMetric | DataMetric]
+) -> dict[str, set[str]]:
+    """Map each metric label to the columns it applies to."""
+    return {
+        label: _select_metric_columns(comp, m.selector) for label, m in metrics.items()
     }
 
-    all_columns = sorted(set().union(*metric_to_columns.values()))
-    if not all_columns:
+
+def _compute_change_metrics(
+    comp: DataFrameComparison,
+    metrics: Mapping[str, ChangeMetric],
+) -> dict[str, dict[str, Any]]:
+    """Compute change metrics over the joined (matched) rows only.
+
+    Change metrics compare matched rows and therefore require a primary key and at least
+    one joined row.
+    """
+    if comp.primary_key is None or comp.num_rows_joined() == 0:
+        return {}
+    metric_to_columns = _metric_target_columns(comp, metrics)
+    if not any(metric_to_columns.values()):
         return {}
-    out: dict[str, dict[str, Any]] = {c: {} for c in all_columns}
 
-    joined = comp.joined(lazy=True)
     agg_exprs = [
         metric.fn(
             pl.col(f"{column}_{Side.LEFT}"),
@@ -963,20 +1038,50 @@ def select_columns(selector: cs.Selector) -> set[str]:
         for label, metric in metrics.items()
         for column in sorted(metric_to_columns[label])
     ]
-    row = joined.select(agg_exprs).collect().row(0, named=True)
-    for label, columns in metric_to_columns.items():
-        for column in columns:
+
+    row = comp.joined(lazy=True).select(agg_exprs).collect().row(0, named=True)
+    out: dict[str, dict[str, Any]] = {
+        c: {} for c in set().union(*metric_to_columns.values())
+    }
+    for label in metrics:
+        for column in metric_to_columns[label]:
             out[column][label] = row[f"{label}__{column}"]
     return out
 
 
+def _compute_data_metrics(
+    comp: DataFrameComparison,
+    metrics: Mapping[str, DataMetric],
+    metric_to_columns: dict[str, set[str]],
+) -> dict[str, dict[str, Any]]:
+    """Compute data metrics over the entire left and right columns, including rows that
+    are not part of the join."""
+    agg_exprs: list[pl.Expr] = []
+    for label, metric in metrics.items():
+        for column in sorted(metric_to_columns[label]):
+            agg_exprs.append(metric.fn(pl.col(column)).alias(f"{label}__{column}"))
+
+    left_row = comp.left.select(agg_exprs).collect().row(0, named=True)
+    right_row = comp.right.select(agg_exprs).collect().row(0, named=True)
+    out: dict[str, dict[str, Any]] = {
+        c: {} for c in set().union(*metric_to_columns.values())
+    }
+    for label in metrics:
+        for column in metric_to_columns[label]:
+            out[column][label] = DataMetricResult(
+                left=left_row[f"{label}__{column}"],
+                right=right_row[f"{label}__{column}"],
+            )
+    return out
+
+
 def _compute_columns(
     comp: DataFrameComparison,
     slim: bool,
     show_perfect_column_matches: bool,
     top_k_changes_by_column: dict[str, int],
     show_sample_primary_key_per_change: bool,
-    metrics_by_column: dict[str, dict[str, Any]],
+    change_metrics_by_column: dict[str, dict[str, Any]],
 ) -> list[SummaryDataColumn] | None:
     # NOTE: We can only compute column matches if there are primary key columns and at
     # least one joined row.
@@ -1023,12 +1128,36 @@ def _compute_columns(
                 match_rate=rate,
                 n_total_changes=n_total_changes,
                 changes=changes,
-                metrics=metrics_by_column.get(col_name),
+                change_metrics=change_metrics_by_column.get(col_name),
             )
         )
     return columns
 
 
+def _compute_data_inspection(
+    comp: DataFrameComparison,
+    metrics: Mapping[str, DataMetric],
+    hidden_columns: list[str],
+) -> list[SummaryDataInspectionColumn] | None:
+    # NOTE: Data metrics describe each side individually and do not need a join, but we
+    # still require the columns to be present on both sides so left/right values are
+    # comparable.
+    hidden = set(hidden_columns)
+    metric_to_columns = {
+        label: columns - hidden
+        for label, columns in _metric_target_columns(comp, metrics).items()
+    }
+    if not any(metric_to_columns.values()):
+        return None
+    data_metrics_by_column = _compute_data_metrics(comp, metrics, metric_to_columns)
+    return [
+        SummaryDataInspectionColumn(
+            name=col_name, data_metrics=data_metrics_by_column[col_name]
+        )
+        for col_name in sorted(data_metrics_by_column)
+    ]
+
+
 def _compute_sample_rows(
     comp: DataFrameComparison, sample_k_rows_only: int
 ) -> tuple[list[tuple[Any, ...]] | None, list[tuple[Any, ...]] | None]:
@@ -1141,5 +1270,41 @@ def _format_metric_value(value: Any) -> str:
     return _format_value(value, float_format=".4g")
 
 
+def _format_data_metric_result(
+    result: DataMetricResult | None,
+    formatter: Callable[[Any], str] | None,
+    delta_formatter: Callable[[Any], str] | None,
+) -> str:
+    """Format a data metric's left/right pair as ``<left> -> <right>``.
+
+    Numeric values additionally show the signed delta ``(<right - left>)``; non-numeric
+    values omit it. ``formatter`` formats a left/right value and ``delta_formatter`` the
+    delta magnitude (rendered with an explicit sign); either falling back to ``.4g``
+    precision for floats when unset.
+    """
+    if result is None:
+        return ""
+
+    def _fmt(v: Any, fn: Callable[[Any], str] | None) -> str:
+        if v is None:
+            return "None"
+        if fn is not None:
+            return fn(v)
+        if isinstance(v, float):
+            return format(v, ".4g")
+        return str(v)
+
+    text = f"{_fmt(result.left, formatter)} -> {_fmt(result.right, formatter)}"
+    if _is_numeric(result.left) and _is_numeric(result.right):
+        delta = result.right - result.left
+        sign = "+" if delta >= 0 else "-"
+        text += f" ({sign}{_fmt(abs(delta), delta_formatter or formatter)})"
+    return _yellow(text)
+
+
+def _is_numeric(value: Any) -> bool:
+    return isinstance(value, (int, float)) and not isinstance(value, bool)
+
+
 def _trim_whitespaces(s: str) -> str:
     return "\n".join(line.rstrip() for line in s.splitlines())
diff --git a/diffly/testing.py b/diffly/testing.py
index 9a36458..337d5e4 100644
--- a/diffly/testing.py
+++ b/diffly/testing.py
@@ -19,7 +19,8 @@
 
 from ._compat import dy
 from .comparison import DataFrameComparison, compare_frames
-from .metrics import Metric, MetricFn
+from .metrics.change import ChangeMetric, ChangeMetricFn
+from .metrics.data import DataMetric, DataMetricFn
 
 
 def assert_collection_equal(
@@ -40,7 +41,8 @@ def assert_collection_equal(
     right_name: str = Side.RIGHT,
     slim: bool = False,
     hidden_columns: list[str] | None = None,
-    metrics: Mapping[str, MetricFn | Metric] | None = None,
+    data_metrics: Mapping[str, DataMetricFn | DataMetric] | None = None,
+    change_metrics: Mapping[str, ChangeMetricFn | ChangeMetric] | None = None,
 ) -> None:
     """Assert that two :mod:`dataframely` collections are equal.
 
@@ -84,12 +86,18 @@ def assert_collection_equal(
             advanced users who are familiar with the summary format.
         hidden_columns: Columns for which no values are printed, e.g. because they
             contain sensitive information.
-        metrics: Optional mapping from display label to a metric callable
-            ``(left_expr, right_expr) -> pl.Expr`` or a :class:`~diffly.metrics.Metric`.
-            Bare callables are only computed for numerical columns; wrap one in a
-            :class:`~diffly.metrics.Metric` with a column selector to target other column
-            types. See :mod:`diffly.metrics` for presets. When ``None`` (default), no
-            metrics are computed; presets are not applied automatically.
+        data_metrics: Optional mapping from display label to a
+            :class:`~diffly.metrics.data.DataMetric` or a bare callable taking a single
+            column expression, describing each dataset individually. To target other
+            column types, construct the metric explicitly with a column selector.
+            See :mod:`diffly.metrics` for presets. When ``None`` (default), no data
+            metrics are computed.
+        change_metrics: Optional mapping from display label to a
+            :class:`~diffly.metrics.change.ChangeMetric` or a bare callable taking a
+            pair of column expressions, quantifying the change between the two sides. To
+            target other column types, construct the metric explicitly with a column
+            selector. See :mod:`diffly.metrics` for presets. When ``None`` (default), no
+            change metrics are computed.
 
     Raises:
         AssertionError: If the collections are not equal.
@@ -146,7 +154,8 @@ def assert_collection_equal(
                             right_name=right_name,
                             slim=slim,
                             hidden_columns=hidden_columns,
-                            metrics=metrics,
+                            data_metrics=data_metrics,
+                            change_metrics=change_metrics,
                         )
                     )
                 }"""
@@ -176,7 +185,8 @@ def assert_frame_equal(
     right_name: str = Side.RIGHT,
     slim: bool = False,
     hidden_columns: list[str] | None = None,
-    metrics: Mapping[str, MetricFn | Metric] | None = None,
+    data_metrics: Mapping[str, DataMetricFn | DataMetric] | None = None,
+    change_metrics: Mapping[str, ChangeMetricFn | ChangeMetric] | None = None,
 ) -> None:
     """Assert that two :mod:`polars` data frames are equal.
 
@@ -227,12 +237,18 @@ def assert_frame_equal(
             advanced users who are familiar with the summary format.
         hidden_columns: Columns for which no values are printed, e.g. because they
             contain sensitive information.
-        metrics: Optional mapping from display label to a metric callable
-            ``(left_expr, right_expr) -> pl.Expr`` or a :class:`~diffly.metrics.Metric`.
-            Bare callables are only computed for numerical columns; wrap one in a
-            :class:`~diffly.metrics.Metric` with a column selector to target other column
-            types. See :mod:`diffly.metrics` for presets. When ``None`` (default), no
-            metrics are computed; presets are not applied automatically.
+        data_metrics: Optional mapping from display label to a
+            :class:`~diffly.metrics.data.DataMetric` or a bare callable taking a single
+            column expression, describing each dataset individually. To target other
+            column types, construct the metric explicitly with a column selector.
+            See :mod:`diffly.metrics` for presets. When ``None`` (default), no data
+            metrics are computed.
+        change_metrics: Optional mapping from display label to a
+            :class:`~diffly.metrics.change.ChangeMetric` or a bare callable taking a
+            pair of column expressions, quantifying the change between the two sides. To
+            target other column types, construct the metric explicitly with a column
+            selector. See :mod:`diffly.metrics` for presets. When ``None`` (default), no
+            change metrics are computed.
 
     Raises:
         AssertionError: If the data frames are not equal.
@@ -278,7 +294,8 @@ def assert_frame_equal(
             right_name=right_name,
             slim=slim,
             hidden_columns=hidden_columns,
-            metrics=metrics,
+            data_metrics=data_metrics,
+            change_metrics=change_metrics,
         )
         text = textwrap.indent(str(summary), " " * 2)
         raise AssertionError(f"Data frames are not equal:\n\n{text}")
diff --git a/docs/api/index.rst b/docs/api/index.rst
index e0a44a9..e9a0d32 100644
--- a/docs/api/index.rst
+++ b/docs/api/index.rst
@@ -27,7 +27,8 @@ API Reference
       :link: metrics
       :link-type: doc
 
-      Built-in metric presets and the ``MetricFn`` callable for ``summary(metrics=...)``.
+      Built-in metric presets and the metric types for
+      ``summary(data_metrics=..., change_metrics=...)``.
 
    .. grid-item-card:: Testing
       :link: testing
diff --git a/docs/api/metrics.rst b/docs/api/metrics.rst
index 84c8f82..ce9f7fd 100644
--- a/docs/api/metrics.rst
+++ b/docs/api/metrics.rst
@@ -5,32 +5,29 @@ Metrics
 .. currentmodule:: diffly.metrics
 
 Metrics are scalar aggregations computed per column when generating a
-:meth:`~diffly.comparison.DataFrameComparison.summary`. Pass them via the
-``metrics`` argument as a mapping from display label to a :data:`MetricFn`
-callable. :mod:`diffly.metrics` ships a set of presets; you can also supply
-your own callable ``(left_expr, right_expr) -> pl.Expr``.
-
-A bare callable is only computed for numerical columns. To target a different
-set of columns, wrap it in a :class:`Metric` with a column selector, e.g.
-``Metric(fn, selector=cs.all())``, ``Metric(fn, selector=cs.boolean())``, or
-``Metric(fn, selector=cs.by_name("my_column_name"))``.
-
-Presets come in two families, each with its own module and default set:
-
-- :mod:`diffly.metrics.change` describes the *change* between numeric columns by
-  aggregating over ``right - left``.
-- :mod:`diffly.metrics.data` describes the left and right datasets *individually*,
-  so you can see how a change affects the data.
-
-The change default set is exposed as :data:`DEFAULT_METRICS`.
-
-.. autodata:: MetricFn
-   :no-value:
-
-.. autoclass:: Metric
-
-.. autodata:: DEFAULT_METRICS
-   :no-value:
+:meth:`~diffly.comparison.DataFrameComparison.summary`. There are two families,
+each passed via its own argument:
+
+- A :class:`~diffly.metrics.change.ChangeMetric`, passed via the ``change_metrics``
+  argument, describes the *change* between the two sides. Its callable takes
+  ``(left_expr, right_expr)`` and aggregates over the difference (e.g. the mean
+  delta). It is rendered as a column in the "Columns" table.
+- A :class:`~diffly.metrics.data.DataMetric`, passed via the ``data_metrics``
+  argument, describes each dataset *individually*. Its callable takes a single
+  column expression and is evaluated on the left and right side separately (e.g. the
+  fraction of null entries). It is rendered in the "Data Inspection" section, showing
+  the left and right value side by side.
+
+Each argument is a mapping from display label to a metric. A bare callable is
+wrapped in the metric of the corresponding family: ``change_metrics`` callables
+become a :class:`~diffly.metrics.change.ChangeMetric` (computed for numerical
+columns only), ``data_metrics`` callables become a
+:class:`~diffly.metrics.data.DataMetric` (computed for all columns). To target a
+different set of columns, construct the metric explicitly with a column selector,
+e.g. ``ChangeMetric(fn, selector=cs.all())`` or ``DataMetric(fn, selector=cs.boolean())``.
+
+The preset default sets are :data:`~diffly.metrics.change.DEFAULT_CHANGE_METRICS`
+and :data:`~diffly.metrics.data.DEFAULT_DATA_METRICS`.
 
 Change metrics
 ==============
@@ -40,6 +37,11 @@ Change metrics
 Metrics that describe the change between numeric columns by aggregating over
 ``right - left``.
 
+.. autodata:: ChangeMetricFn
+   :no-value:
+
+.. autoclass:: ChangeMetric
+
 .. autosummary::
    :toctree: _gen/
 
@@ -63,10 +65,15 @@ Data metrics
 Metrics that describe the left and right datasets individually, so you can
 understand how a change affects the data.
 
+.. autodata:: DataMetricFn
+   :no-value:
+
+.. autoclass:: DataMetric
+
 .. autosummary::
    :toctree: _gen/
 
-   null_fraction_change
+   null_fraction
 
 .. autodata:: DEFAULT_DATA_METRICS
    :no-value:
diff --git a/docs/guides/features/summary.ipynb b/docs/guides/features/summary.ipynb
index bec4877..dcf19c4 100644
--- a/docs/guides/features/summary.ipynb
+++ b/docs/guides/features/summary.ipynb
@@ -534,9 +534,9 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### Numerical metrics\n",
+    "### Change metrics\n",
     "\n",
-    "Use `metrics` to display per-column aggregations over `right - left` for numerical columns. Pass a mapping from display label to a callable; the built-in presets live in `diffly.metrics`. You can also pass your own callable taking two Polars expressions (left and right) and returning a scalar aggregation."
+    "Use `change_metrics` to display per-column aggregations over `right - left` for numerical columns. Pass a mapping from display label to a callable; the built-in presets live in `diffly.metrics.change`. You can also pass your own callable taking two Polars expressions (left and right) and returning a scalar aggregation."
    ]
   },
   {
@@ -550,10 +550,36 @@
     "print(\n",
     "    comparison.summary(\n",
     "        top_k_column_changes=3,\n",
-    "        metrics={\n",
-    "            \"Mean\": metrics.mean,\n",
-    "            \"Mean relative deviation\": metrics.mean_relative_deviation,\n",
-    "            \"Max absolute deviation\": lambda l, r: (r - l).abs().max(),\n",
+    "        change_metrics={\n",
+    "            \"Mean diff\": metrics.change.mean,\n",
+    "            \"Mean relative diff\": metrics.change.mean_relative_deviation,\n",
+    "            \"Max absolute diff\": lambda left, right: (right - left).abs().max(),\n",
+    "        },\n",
+    "    )\n",
+    ")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Data metrics\n",
+    "\n",
+    "Use `data_metrics` to display per-column metrics of the individual data sets (left and right). Pass a mapping from display label to a callable; the built-in presets live in `diffly.metrics.data`. You can also pass your own callable taking a Polars expression (the column) and returning a scalar value."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from diffly import metrics\n",
+    "\n",
+    "print(\n",
+    "    comparison.summary(\n",
+    "        data_metrics={\n",
+    "            \"Null%\": metrics.data.null_fraction,\n",
     "        },\n",
     "    )\n",
     ")"
diff --git a/pixi.lock b/pixi.lock
index 184fd51..0a6bc50 100644
--- a/pixi.lock
+++ b/pixi.lock
@@ -2068,7 +2068,7 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/cfgv-3.5.0-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/charset-normalizer-3.4.7-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/distlib-0.4.3-pyhcf101f3_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/docformatter-1.7.8-pyhc364b38_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/docformatter-1.7.7-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/filelock-3.29.5-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/identify-2.6.19-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/importlib-metadata-9.0.0-pyhcf101f3_0.conda
@@ -2085,6 +2085,7 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/tomli-2.4.1-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/typing_extensions-4.16.0-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/tzdata-2025c-hc9c84f9_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/untokenize-0.1.1-pyhcf101f3_3.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/virtualenv-21.5.1-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/zipp-4.1.0-pyhcf101f3_0.conda
       linux-aarch64:
@@ -2140,7 +2141,7 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/cfgv-3.5.0-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/charset-normalizer-3.4.7-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/distlib-0.4.3-pyhcf101f3_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/docformatter-1.7.8-pyhc364b38_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/docformatter-1.7.7-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/filelock-3.29.5-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/identify-2.6.19-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/importlib-metadata-9.0.0-pyhcf101f3_0.conda
@@ -2157,6 +2158,7 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/tomli-2.4.1-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/typing_extensions-4.16.0-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/tzdata-2025c-hc9c84f9_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/untokenize-0.1.1-pyhcf101f3_3.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/virtualenv-21.5.1-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/zipp-4.1.0-pyhcf101f3_0.conda
       osx-64:
@@ -2164,7 +2166,7 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/cfgv-3.5.0-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/charset-normalizer-3.4.7-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/distlib-0.4.3-pyhcf101f3_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/docformatter-1.7.8-pyhc364b38_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/docformatter-1.7.7-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/filelock-3.29.5-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/identify-2.6.19-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/importlib-metadata-9.0.0-pyhcf101f3_0.conda
@@ -2181,6 +2183,7 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/tomli-2.4.1-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/typing_extensions-4.16.0-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/tzdata-2025c-hc9c84f9_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/untokenize-0.1.1-pyhcf101f3_3.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/virtualenv-21.5.1-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/zipp-4.1.0-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-64/_openmp_mutex-4.5-7_kmp_llvm.conda
@@ -2232,7 +2235,7 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/cfgv-3.5.0-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/charset-normalizer-3.4.7-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/distlib-0.4.3-pyhcf101f3_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/docformatter-1.7.8-pyhc364b38_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/docformatter-1.7.7-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/filelock-3.29.5-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/identify-2.6.19-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/importlib-metadata-9.0.0-pyhcf101f3_0.conda
@@ -2249,6 +2252,7 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/tomli-2.4.1-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/typing_extensions-4.16.0-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/tzdata-2025c-hc9c84f9_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/untokenize-0.1.1-pyhcf101f3_3.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/virtualenv-21.5.1-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/zipp-4.1.0-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/_openmp_mutex-4.5-7_kmp_llvm.conda
@@ -2301,7 +2305,7 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/cfgv-3.5.0-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/charset-normalizer-3.4.7-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/distlib-0.4.3-pyhcf101f3_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/docformatter-1.7.8-pyhc364b38_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/docformatter-1.7.7-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/filelock-3.29.5-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/identify-2.6.19-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/importlib-metadata-9.0.0-pyhcf101f3_0.conda
@@ -2318,6 +2322,7 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/tomli-2.4.1-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/typing_extensions-4.16.0-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/tzdata-2025c-hc9c84f9_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/untokenize-0.1.1-pyhcf101f3_3.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/virtualenv-21.5.1-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/zipp-4.1.0-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/win-64/bzip2-1.0.8-h0ad9c76_9.conda
@@ -7366,18 +7371,18 @@ packages:
   run_exports: {}
   size: 303705
   timestamp: 1781320269259
-- conda: https://conda.anaconda.org/conda-forge/noarch/docformatter-1.7.8-pyhc364b38_0.conda
-  sha256: 3e57149faca76593a869d91242dd166a9cc816cb7f01e3b39bda90e44407818e
-  md5: 2207be19c7b2f72e46e9d4049cb4cabc
+- conda: https://conda.anaconda.org/conda-forge/noarch/docformatter-1.7.7-pyhd8ed1ab_0.conda
+  sha256: 290a1d9935947c72d90781efad59d7be36fc3e6c9ce4bf5d5478804ce9070006
+  md5: b1e2509c25d36f7b19ceb42193120071
   depends:
   - charset-normalizer >=3.0.0
-  - python >=3.10
-  - python
+  - python >=3.9
+  - untokenize >=0.1.1
   license: MIT
   license_family: MIT
   run_exports: {}
-  size: 41556
-  timestamp: 1777489364203
+  size: 30130
+  timestamp: 1746994987190
 - conda: https://conda.anaconda.org/conda-forge/noarch/docutils-0.22.4-pyhd8ed1ab_0.conda
   sha256: 0d605569a77350fb681f9ed8d357cc71649b59a304099dc9d09fbeec5e84a65e
   md5: d6bd3cd217e62bbd7efe67ff224cd667
@@ -9526,6 +9531,17 @@ packages:
   run_exports: {}
   size: 119135
   timestamp: 1767016325805
+- conda: https://conda.anaconda.org/conda-forge/noarch/untokenize-0.1.1-pyhcf101f3_3.conda
+  sha256: 557f4cef95e3f239d9b7c2e75b32840f0fe1b2c62a9832da76bb51ae3d080687
+  md5: 5ab2494adac58ab85da2e8e4ed0fa057
+  depends:
+  - python >=3.10
+  - python
+  license: MIT
+  license_family: MIT
+  run_exports: {}
+  size: 11029
+  timestamp: 1767727736121
 - conda: https://conda.anaconda.org/conda-forge/noarch/uri-template-1.3.0-pyhd8ed1ab_1.conda
   sha256: e0eb6c8daf892b3056f08416a96d68b0a358b7c46b99c8a50481b22631a4dfc0
   md5: e7cb0f5745e4c5035a460248334af7eb
diff --git a/pixi.toml b/pixi.toml
index aa10b3d..b359b8c 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -49,7 +49,7 @@ build-wheel = "python -m build --no-isolation ."
 check-wheel = "twine check dist/*"
 
 [feature.lint.dependencies]
-docformatter = "*"
+docformatter = "<1.7.8"
 insert-license-header = "*"
 pre-commit = "*"
 pre-commit-hooks = "*"
diff --git a/tests/cli/test_cli.py b/tests/cli/test_cli.py
index a6720c7..4d2ea47 100644
--- a/tests/cli/test_cli.py
+++ b/tests/cli/test_cli.py
@@ -80,7 +80,19 @@ def test_cli_hidden_columns_alias_warns(tmp_path: Path) -> None:
     assert result.exit_code == 0
 
 
-def test_cli_unknown_metric(tmp_path: Path) -> None:
+@pytest.mark.parametrize(
+    "flag, name, expected",
+    [
+        ("--change-metric", "bogus", "Unknown change metric"),
+        ("--data-metric", "bogus", "Unknown data metric"),
+        # A valid preset from the wrong family is rejected by the family-specific flag.
+        ("--change-metric", "Null%", "Unknown change metric"),
+        ("--data-metric", "Mean diff", "Unknown data metric"),
+    ],
+)
+def test_cli_unknown_metric(
+    tmp_path: Path, flag: str, name: str, expected: str
+) -> None:
     left = pl.DataFrame({"id": [1, 2], "x": [1.0, 2.0]})
     right = pl.DataFrame({"id": [1, 2], "x": [1.0, 3.0]})
     left.write_parquet(tmp_path / "left.parquet")
@@ -93,17 +105,21 @@ def test_cli_unknown_metric(tmp_path: Path) -> None:
             str(tmp_path / "right.parquet"),
             "--primary-key",
             "id",
-            "--metric",
-            "bogus",
+            flag,
+            name,
         ],
     )
     assert result.exit_code != 0
-    assert "Unknown metric" in result.output
+    assert expected in result.output
 
 
-@pytest.mark.parametrize("metric_name", ["Mean", "Null%"])
-def test_cli_metric_from_both_defaults(tmp_path: Path, metric_name: str) -> None:
-    # Both change ("mean") and data ("Null%") presets are selectable via --metric.
+@pytest.mark.parametrize(
+    "flag, metric_name", [("--change-metric", "Mean diff"), ("--data-metric", "Null%")]
+)
+def test_cli_metric_from_both_defaults(
+    tmp_path: Path, flag: str, metric_name: str
+) -> None:
+    # Change presets are selectable via --change-metric, data presets via --data-metric.
     left = pl.DataFrame({"id": [1, 2], "x": [1.0, None]})
     right = pl.DataFrame({"id": [1, 2], "x": [1.0, 3.0]})
     left.write_parquet(tmp_path / "left.parquet")
@@ -116,7 +132,7 @@ def test_cli_metric_from_both_defaults(tmp_path: Path, metric_name: str) -> None
             str(tmp_path / "right.parquet"),
             "--primary-key",
             "id",
-            "--metric",
+            flag,
             metric_name,
         ],
     )
diff --git a/tests/summary/fixtures/metrics_custom/test_metrics_custom.py b/tests/summary/fixtures/metrics_custom/test_metrics_custom.py
index 61d257d..c51fbab 100644
--- a/tests/summary/fixtures/metrics_custom/test_metrics_custom.py
+++ b/tests/summary/fixtures/metrics_custom/test_metrics_custom.py
@@ -29,9 +29,9 @@ def test_generate() -> None:
     comp = compare_frames(left, right, primary_key=["id"])
     generate_summaries(
         comp,
-        metrics={
-            "mean_delta": metrics.mean,
-            "p95_delta": metrics.quantile(0.95),
+        change_metrics={
+            "mean_delta": metrics.change.mean,
+            "p95_delta": metrics.change.quantile(0.95),
             "max_abs_delta": lambda left, right: (right - left).abs().max(),
         },
     )
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
new file mode 100644
index 0000000..b6a38d4
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -0,0 +1,23 @@
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃                                     Diffly Summary                                     ┃
+┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+   Attention: the data frames do not match exactly, but as no primary key columns are
+   provided, the row and column matches cannot be computed.
+
+ Schemas
+ ▔▔▔▔▔▔▔
+   Schemas match exactly (column count: 3).
+
+ Rows
+ ▔▔▔▔
+   The number of rows matches exactly (row count: 5).
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
new file mode 100644
index 0000000..b6a38d4
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -0,0 +1,23 @@
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃                                     Diffly Summary                                     ┃
+┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+   Attention: the data frames do not match exactly, but as no primary key columns are
+   provided, the row and column matches cannot be computed.
+
+ Schemas
+ ▔▔▔▔▔▔▔
+   Schemas match exactly (column count: 3).
+
+ Rows
+ ▔▔▔▔
+   The number of rows matches exactly (row count: 5).
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
new file mode 100644
index 0000000..288a3cf
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -0,0 +1,12 @@
+   Attention: the data frames do not match exactly, but as no primary key columns are
+   provided, the row and column matches cannot be computed.
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
new file mode 100644
index 0000000..288a3cf
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -0,0 +1,12 @@
+   Attention: the data frames do not match exactly, but as no primary key columns are
+   provided, the row and column matches cannot be computed.
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
new file mode 100644
index 0000000..b6a38d4
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -0,0 +1,23 @@
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃                                     Diffly Summary                                     ┃
+┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+   Attention: the data frames do not match exactly, but as no primary key columns are
+   provided, the row and column matches cannot be computed.
+
+ Schemas
+ ▔▔▔▔▔▔▔
+   Schemas match exactly (column count: 3).
+
+ Rows
+ ▔▔▔▔
+   The number of rows matches exactly (row count: 5).
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
new file mode 100644
index 0000000..b6a38d4
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -0,0 +1,23 @@
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃                                     Diffly Summary                                     ┃
+┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+   Attention: the data frames do not match exactly, but as no primary key columns are
+   provided, the row and column matches cannot be computed.
+
+ Schemas
+ ▔▔▔▔▔▔▔
+   Schemas match exactly (column count: 3).
+
+ Rows
+ ▔▔▔▔
+   The number of rows matches exactly (row count: 5).
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
new file mode 100644
index 0000000..288a3cf
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -0,0 +1,12 @@
+   Attention: the data frames do not match exactly, but as no primary key columns are
+   provided, the row and column matches cannot be computed.
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
new file mode 100644
index 0000000..288a3cf
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -0,0 +1,12 @@
+   Attention: the data frames do not match exactly, but as no primary key columns are
+   provided, the row and column matches cannot be computed.
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
new file mode 100644
index 0000000..b6a38d4
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -0,0 +1,23 @@
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃                                     Diffly Summary                                     ┃
+┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+   Attention: the data frames do not match exactly, but as no primary key columns are
+   provided, the row and column matches cannot be computed.
+
+ Schemas
+ ▔▔▔▔▔▔▔
+   Schemas match exactly (column count: 3).
+
+ Rows
+ ▔▔▔▔
+   The number of rows matches exactly (row count: 5).
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
new file mode 100644
index 0000000..b6a38d4
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -0,0 +1,23 @@
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃                                     Diffly Summary                                     ┃
+┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+   Attention: the data frames do not match exactly, but as no primary key columns are
+   provided, the row and column matches cannot be computed.
+
+ Schemas
+ ▔▔▔▔▔▔▔
+   Schemas match exactly (column count: 3).
+
+ Rows
+ ▔▔▔▔
+   The number of rows matches exactly (row count: 5).
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
new file mode 100644
index 0000000..288a3cf
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -0,0 +1,12 @@
+   Attention: the data frames do not match exactly, but as no primary key columns are
+   provided, the row and column matches cannot be computed.
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
new file mode 100644
index 0000000..288a3cf
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -0,0 +1,12 @@
+   Attention: the data frames do not match exactly, but as no primary key columns are
+   provided, the row and column matches cannot be computed.
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
new file mode 100644
index 0000000..b6a38d4
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -0,0 +1,23 @@
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃                                     Diffly Summary                                     ┃
+┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+   Attention: the data frames do not match exactly, but as no primary key columns are
+   provided, the row and column matches cannot be computed.
+
+ Schemas
+ ▔▔▔▔▔▔▔
+   Schemas match exactly (column count: 3).
+
+ Rows
+ ▔▔▔▔
+   The number of rows matches exactly (row count: 5).
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
new file mode 100644
index 0000000..b6a38d4
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -0,0 +1,23 @@
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃                                     Diffly Summary                                     ┃
+┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+   Attention: the data frames do not match exactly, but as no primary key columns are
+   provided, the row and column matches cannot be computed.
+
+ Schemas
+ ▔▔▔▔▔▔▔
+   Schemas match exactly (column count: 3).
+
+ Rows
+ ▔▔▔▔
+   The number of rows matches exactly (row count: 5).
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
new file mode 100644
index 0000000..288a3cf
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -0,0 +1,12 @@
+   Attention: the data frames do not match exactly, but as no primary key columns are
+   provided, the row and column matches cannot be computed.
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
new file mode 100644
index 0000000..288a3cf
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -0,0 +1,12 @@
+   Attention: the data frames do not match exactly, but as no primary key columns are
+   provided, the row and column matches cannot be computed.
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
new file mode 100644
index 0000000..1016d10
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -0,0 +1,23 @@
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃                                     Diffly Summary                                     ┃
+┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+   Attention: the data frames do not match exactly, but as no primary key columns are 
+   provided, the row and column matches cannot be computed.
+
+ Schemas
+ ▔▔▔▔▔▔▔
+   Schemas match exactly (column count: 3).
+
+ Rows
+ ▔▔▔▔
+   The number of rows matches exactly (row count: 5).
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
new file mode 100644
index 0000000..1016d10
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -0,0 +1,23 @@
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃                                     Diffly Summary                                     ┃
+┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+   Attention: the data frames do not match exactly, but as no primary key columns are 
+   provided, the row and column matches cannot be computed.
+
+ Schemas
+ ▔▔▔▔▔▔▔
+   Schemas match exactly (column count: 3).
+
+ Rows
+ ▔▔▔▔
+   The number of rows matches exactly (row count: 5).
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
new file mode 100644
index 0000000..036091a
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -0,0 +1,12 @@
+   Attention: the data frames do not match exactly, but as no primary key columns are 
+   provided, the row and column matches cannot be computed.
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
new file mode 100644
index 0000000..036091a
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -0,0 +1,12 @@
+   Attention: the data frames do not match exactly, but as no primary key columns are 
+   provided, the row and column matches cannot be computed.
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
new file mode 100644
index 0000000..1016d10
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -0,0 +1,23 @@
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃                                     Diffly Summary                                     ┃
+┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+   Attention: the data frames do not match exactly, but as no primary key columns are 
+   provided, the row and column matches cannot be computed.
+
+ Schemas
+ ▔▔▔▔▔▔▔
+   Schemas match exactly (column count: 3).
+
+ Rows
+ ▔▔▔▔
+   The number of rows matches exactly (row count: 5).
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
new file mode 100644
index 0000000..1016d10
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -0,0 +1,23 @@
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃                                     Diffly Summary                                     ┃
+┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+   Attention: the data frames do not match exactly, but as no primary key columns are 
+   provided, the row and column matches cannot be computed.
+
+ Schemas
+ ▔▔▔▔▔▔▔
+   Schemas match exactly (column count: 3).
+
+ Rows
+ ▔▔▔▔
+   The number of rows matches exactly (row count: 5).
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
new file mode 100644
index 0000000..036091a
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -0,0 +1,12 @@
+   Attention: the data frames do not match exactly, but as no primary key columns are 
+   provided, the row and column matches cannot be computed.
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
new file mode 100644
index 0000000..036091a
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -0,0 +1,12 @@
+   Attention: the data frames do not match exactly, but as no primary key columns are 
+   provided, the row and column matches cannot be computed.
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
new file mode 100644
index 0000000..1016d10
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -0,0 +1,23 @@
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃                                     Diffly Summary                                     ┃
+┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+   Attention: the data frames do not match exactly, but as no primary key columns are 
+   provided, the row and column matches cannot be computed.
+
+ Schemas
+ ▔▔▔▔▔▔▔
+   Schemas match exactly (column count: 3).
+
+ Rows
+ ▔▔▔▔
+   The number of rows matches exactly (row count: 5).
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
new file mode 100644
index 0000000..1016d10
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -0,0 +1,23 @@
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃                                     Diffly Summary                                     ┃
+┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+   Attention: the data frames do not match exactly, but as no primary key columns are 
+   provided, the row and column matches cannot be computed.
+
+ Schemas
+ ▔▔▔▔▔▔▔
+   Schemas match exactly (column count: 3).
+
+ Rows
+ ▔▔▔▔
+   The number of rows matches exactly (row count: 5).
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
new file mode 100644
index 0000000..036091a
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -0,0 +1,12 @@
+   Attention: the data frames do not match exactly, but as no primary key columns are 
+   provided, the row and column matches cannot be computed.
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
new file mode 100644
index 0000000..036091a
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -0,0 +1,12 @@
+   Attention: the data frames do not match exactly, but as no primary key columns are 
+   provided, the row and column matches cannot be computed.
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
new file mode 100644
index 0000000..1016d10
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -0,0 +1,23 @@
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃                                     Diffly Summary                                     ┃
+┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+   Attention: the data frames do not match exactly, but as no primary key columns are 
+   provided, the row and column matches cannot be computed.
+
+ Schemas
+ ▔▔▔▔▔▔▔
+   Schemas match exactly (column count: 3).
+
+ Rows
+ ▔▔▔▔
+   The number of rows matches exactly (row count: 5).
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
new file mode 100644
index 0000000..1016d10
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -0,0 +1,23 @@
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+┃                                     Diffly Summary                                     ┃
+┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+   Attention: the data frames do not match exactly, but as no primary key columns are 
+   provided, the row and column matches cannot be computed.
+
+ Schemas
+ ▔▔▔▔▔▔▔
+   Schemas match exactly (column count: 3).
+
+ Rows
+ ▔▔▔▔
+   The number of rows matches exactly (row count: 5).
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
new file mode 100644
index 0000000..036091a
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -0,0 +1,12 @@
+   Attention: the data frames do not match exactly, but as no primary key columns are 
+   provided, the row and column matches cannot be computed.
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
new file mode 100644
index 0000000..036091a
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -0,0 +1,12 @@
+   Attention: the data frames do not match exactly, but as no primary key columns are 
+   provided, the row and column matches cannot be computed.
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                 Null% ┃    Distinct ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ id     │   0.0% -> 0.0% (+0.0) │ 5 -> 5 (+0) │        │
+   │ price  │ 20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │        │
+   │ status │ 0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │ e -> x │
+   └────────┴───────────────────────┴─────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_data_no_pk/test_metrics_data_no_pk.py b/tests/summary/fixtures/metrics_data_no_pk/test_metrics_data_no_pk.py
new file mode 100644
index 0000000..e43f2f4
--- /dev/null
+++ b/tests/summary/fixtures/metrics_data_no_pk/test_metrics_data_no_pk.py
@@ -0,0 +1,39 @@
+# Copyright (c) QuantCo 2025-2026
+# SPDX-License-Identifier: BSD-3-Clause
+
+import polars as pl
+import polars.selectors as cs
+import pytest
+
+from diffly import compare_frames
+from diffly.metrics.data import DEFAULT_DATA_METRICS, DataMetric
+from tests.utils import generate_summaries
+
+
+@pytest.mark.generate
+def test_generate() -> None:
+    # No primary key: row and column matches cannot be computed, but data metrics still
+    # characterize each side individually and are shown in the Data Inspection section.
+    left = pl.DataFrame(
+        {
+            "id": [1, 2, 3, 4, 5],
+            "price": [10.0, 20.0, None, 40.0, 50.0],
+            "status": ["a", "b", "c", "d", "e"],
+        }
+    )
+    right = pl.DataFrame(
+        {
+            "id": [1, 2, 3, 4, 6],
+            "price": [10.0, 21.0, 30.0, 42.0, 50.0],
+            "status": ["a", None, "x", None, "e"],
+        }
+    )
+    comp = compare_frames(left, right)
+    generate_summaries(
+        comp,
+        data_metrics={
+            "Null%": DEFAULT_DATA_METRICS["Null%"],
+            "Distinct": DataMetric(fn=lambda col: col.n_unique()),
+            "Max": DataMetric(fn=lambda col: col.max(), selector=cs.string()),
+        },
+    )
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
index 1677141..356dcaf 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,12 +20,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
-   ┃        ┃  Match ┃   Mean ┃ Median ┃ Minimum ┃ Maxim… ┃ Standa… ┃ Absol… ┃ Relati… ┃
-   ┃ Column ┃   Rate ┃  Delta ┃  Delta ┃   Delta ┃  Delta ┃ Deviat… ┃ Devia… ┃ Deviat… ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
-   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
-   │ status │ 80.00% │        │        │         │        │         │        │         │
-   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┓
+   ┃        ┃        ┃        ┃         ┃        ┃         ┃        ┃    Mean ┃   Mean ┃
+   ┃        ┃  Match ┃   Mean ┃  Median ┃ Minim… ┃ Maximum ┃ Stand… ┃ Absolu… ┃ Relat… ┃
+   ┃ Column ┃   Rate ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │       0 │      0 │       2 │ 0.8944 │     0.6 │   0.02 │
+   │ qty    │ 80.00% │    0.2 │       0 │      0 │       1 │ 0.4472 │     0.2 │   0.05 │
+   │ status │ 80.00% │        │         │        │         │        │         │        │
+   └────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
index 1677141..356dcaf 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -20,12 +20,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
-   ┃        ┃  Match ┃   Mean ┃ Median ┃ Minimum ┃ Maxim… ┃ Standa… ┃ Absol… ┃ Relati… ┃
-   ┃ Column ┃   Rate ┃  Delta ┃  Delta ┃   Delta ┃  Delta ┃ Deviat… ┃ Devia… ┃ Deviat… ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
-   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
-   │ status │ 80.00% │        │        │         │        │         │        │         │
-   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┓
+   ┃        ┃        ┃        ┃         ┃        ┃         ┃        ┃    Mean ┃   Mean ┃
+   ┃        ┃  Match ┃   Mean ┃  Median ┃ Minim… ┃ Maximum ┃ Stand… ┃ Absolu… ┃ Relat… ┃
+   ┃ Column ┃   Rate ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │       0 │      0 │       2 │ 0.8944 │     0.6 │   0.02 │
+   │ qty    │ 80.00% │    0.2 │       0 │      0 │       1 │ 0.4472 │     0.2 │   0.05 │
+   │ status │ 80.00% │        │         │        │         │        │         │        │
+   └────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
index ecf5309..c7048c7 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,12 +8,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
-   ┃        ┃  Match ┃   Mean ┃ Median ┃ Minimum ┃ Maxim… ┃ Standa… ┃ Absol… ┃ Relati… ┃
-   ┃ Column ┃   Rate ┃  Delta ┃  Delta ┃   Delta ┃  Delta ┃ Deviat… ┃ Devia… ┃ Deviat… ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
-   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
-   │ status │ 80.00% │        │        │         │        │         │        │         │
-   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┓
+   ┃        ┃        ┃        ┃         ┃        ┃         ┃        ┃    Mean ┃   Mean ┃
+   ┃        ┃  Match ┃   Mean ┃  Median ┃ Minim… ┃ Maximum ┃ Stand… ┃ Absolu… ┃ Relat… ┃
+   ┃ Column ┃   Rate ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │       0 │      0 │       2 │ 0.8944 │     0.6 │   0.02 │
+   │ qty    │ 80.00% │    0.2 │       0 │      0 │       1 │ 0.4472 │     0.2 │   0.05 │
+   │ status │ 80.00% │        │         │        │         │        │         │        │
+   └────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
index ecf5309..c7048c7 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -8,12 +8,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
-   ┃        ┃  Match ┃   Mean ┃ Median ┃ Minimum ┃ Maxim… ┃ Standa… ┃ Absol… ┃ Relati… ┃
-   ┃ Column ┃   Rate ┃  Delta ┃  Delta ┃   Delta ┃  Delta ┃ Deviat… ┃ Devia… ┃ Deviat… ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
-   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
-   │ status │ 80.00% │        │        │         │        │         │        │         │
-   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┓
+   ┃        ┃        ┃        ┃         ┃        ┃         ┃        ┃    Mean ┃   Mean ┃
+   ┃        ┃  Match ┃   Mean ┃  Median ┃ Minim… ┃ Maximum ┃ Stand… ┃ Absolu… ┃ Relat… ┃
+   ┃ Column ┃   Rate ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │       0 │      0 │       2 │ 0.8944 │     0.6 │   0.02 │
+   │ qty    │ 80.00% │    0.2 │       0 │      0 │       1 │ 0.4472 │     0.2 │   0.05 │
+   │ status │ 80.00% │        │         │        │         │        │         │        │
+   └────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
index 588b710..63260c4 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -23,7 +23,7 @@
    ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
    ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
    ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃ Minim… ┃ Maxi… ┃ Stand… ┃ Abso… ┃ Relat… ┃   Top ┃
-   ┃ n     ┃  Rate ┃  Delta ┃ Delta ┃  Delta ┃ Delta ┃ Devia… ┃ Devi… ┃ Devia… ┃ Chan… ┃
+   ┃ n     ┃  Rate ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃ Chan… ┃
    ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
    │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
    │       │       │        │       │        │       │        │       │        │    -> │
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
index 5e06e38..ed232c2 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -23,7 +23,7 @@
    ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
    ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
    ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃ Minim… ┃ Maxi… ┃ Stand… ┃ Abso… ┃ Relat… ┃   Top ┃
-   ┃ n     ┃  Rate ┃  Delta ┃ Delta ┃  Delta ┃ Delta ┃ Devia… ┃ Devi… ┃ Devia… ┃ Chan… ┃
+   ┃ n     ┃  Rate ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃ Chan… ┃
    ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
    │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
    │       │       │        │       │        │       │        │       │        │    -> │
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
index c0d57e5..5ba2bbc 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -11,7 +11,7 @@
    ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
    ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
    ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃ Minim… ┃ Maxi… ┃ Stand… ┃ Abso… ┃ Relat… ┃   Top ┃
-   ┃ n     ┃  Rate ┃  Delta ┃ Delta ┃  Delta ┃ Delta ┃ Devia… ┃ Devi… ┃ Devia… ┃ Chan… ┃
+   ┃ n     ┃  Rate ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃ Chan… ┃
    ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
    │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
    │       │       │        │       │        │       │        │       │        │    -> │
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
index 4b4140c..5570ad3 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -11,7 +11,7 @@
    ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
    ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
    ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃ Minim… ┃ Maxi… ┃ Stand… ┃ Abso… ┃ Relat… ┃   Top ┃
-   ┃ n     ┃  Rate ┃  Delta ┃ Delta ┃  Delta ┃ Delta ┃ Devia… ┃ Devi… ┃ Devia… ┃ Chan… ┃
+   ┃ n     ┃  Rate ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃ Chan… ┃
    ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
    │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
    │       │       │        │       │        │       │        │       │        │    -> │
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
index 1677141..356dcaf 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,12 +20,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
-   ┃        ┃  Match ┃   Mean ┃ Median ┃ Minimum ┃ Maxim… ┃ Standa… ┃ Absol… ┃ Relati… ┃
-   ┃ Column ┃   Rate ┃  Delta ┃  Delta ┃   Delta ┃  Delta ┃ Deviat… ┃ Devia… ┃ Deviat… ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
-   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
-   │ status │ 80.00% │        │        │         │        │         │        │         │
-   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┓
+   ┃        ┃        ┃        ┃         ┃        ┃         ┃        ┃    Mean ┃   Mean ┃
+   ┃        ┃  Match ┃   Mean ┃  Median ┃ Minim… ┃ Maximum ┃ Stand… ┃ Absolu… ┃ Relat… ┃
+   ┃ Column ┃   Rate ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │       0 │      0 │       2 │ 0.8944 │     0.6 │   0.02 │
+   │ qty    │ 80.00% │    0.2 │       0 │      0 │       1 │ 0.4472 │     0.2 │   0.05 │
+   │ status │ 80.00% │        │         │        │         │        │         │        │
+   └────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
index 1677141..356dcaf 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -20,12 +20,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
-   ┃        ┃  Match ┃   Mean ┃ Median ┃ Minimum ┃ Maxim… ┃ Standa… ┃ Absol… ┃ Relati… ┃
-   ┃ Column ┃   Rate ┃  Delta ┃  Delta ┃   Delta ┃  Delta ┃ Deviat… ┃ Devia… ┃ Deviat… ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
-   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
-   │ status │ 80.00% │        │        │         │        │         │        │         │
-   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┓
+   ┃        ┃        ┃        ┃         ┃        ┃         ┃        ┃    Mean ┃   Mean ┃
+   ┃        ┃  Match ┃   Mean ┃  Median ┃ Minim… ┃ Maximum ┃ Stand… ┃ Absolu… ┃ Relat… ┃
+   ┃ Column ┃   Rate ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │       0 │      0 │       2 │ 0.8944 │     0.6 │   0.02 │
+   │ qty    │ 80.00% │    0.2 │       0 │      0 │       1 │ 0.4472 │     0.2 │   0.05 │
+   │ status │ 80.00% │        │         │        │         │        │         │        │
+   └────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
index ecf5309..c7048c7 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,12 +8,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
-   ┃        ┃  Match ┃   Mean ┃ Median ┃ Minimum ┃ Maxim… ┃ Standa… ┃ Absol… ┃ Relati… ┃
-   ┃ Column ┃   Rate ┃  Delta ┃  Delta ┃   Delta ┃  Delta ┃ Deviat… ┃ Devia… ┃ Deviat… ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
-   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
-   │ status │ 80.00% │        │        │         │        │         │        │         │
-   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┓
+   ┃        ┃        ┃        ┃         ┃        ┃         ┃        ┃    Mean ┃   Mean ┃
+   ┃        ┃  Match ┃   Mean ┃  Median ┃ Minim… ┃ Maximum ┃ Stand… ┃ Absolu… ┃ Relat… ┃
+   ┃ Column ┃   Rate ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │       0 │      0 │       2 │ 0.8944 │     0.6 │   0.02 │
+   │ qty    │ 80.00% │    0.2 │       0 │      0 │       1 │ 0.4472 │     0.2 │   0.05 │
+   │ status │ 80.00% │        │         │        │         │        │         │        │
+   └────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
index ecf5309..c7048c7 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -8,12 +8,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
-   ┃        ┃  Match ┃   Mean ┃ Median ┃ Minimum ┃ Maxim… ┃ Standa… ┃ Absol… ┃ Relati… ┃
-   ┃ Column ┃   Rate ┃  Delta ┃  Delta ┃   Delta ┃  Delta ┃ Deviat… ┃ Devia… ┃ Deviat… ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
-   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
-   │ status │ 80.00% │        │        │         │        │         │        │         │
-   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┓
+   ┃        ┃        ┃        ┃         ┃        ┃         ┃        ┃    Mean ┃   Mean ┃
+   ┃        ┃  Match ┃   Mean ┃  Median ┃ Minim… ┃ Maximum ┃ Stand… ┃ Absolu… ┃ Relat… ┃
+   ┃ Column ┃   Rate ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │       0 │      0 │       2 │ 0.8944 │     0.6 │   0.02 │
+   │ qty    │ 80.00% │    0.2 │       0 │      0 │       1 │ 0.4472 │     0.2 │   0.05 │
+   │ status │ 80.00% │        │         │        │         │        │         │        │
+   └────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
index 588b710..63260c4 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -23,7 +23,7 @@
    ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
    ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
    ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃ Minim… ┃ Maxi… ┃ Stand… ┃ Abso… ┃ Relat… ┃   Top ┃
-   ┃ n     ┃  Rate ┃  Delta ┃ Delta ┃  Delta ┃ Delta ┃ Devia… ┃ Devi… ┃ Devia… ┃ Chan… ┃
+   ┃ n     ┃  Rate ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃ Chan… ┃
    ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
    │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
    │       │       │        │       │        │       │        │       │        │    -> │
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
index 5e06e38..ed232c2 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -23,7 +23,7 @@
    ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
    ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
    ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃ Minim… ┃ Maxi… ┃ Stand… ┃ Abso… ┃ Relat… ┃   Top ┃
-   ┃ n     ┃  Rate ┃  Delta ┃ Delta ┃  Delta ┃ Delta ┃ Devia… ┃ Devi… ┃ Devia… ┃ Chan… ┃
+   ┃ n     ┃  Rate ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃ Chan… ┃
    ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
    │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
    │       │       │        │       │        │       │        │       │        │    -> │
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
index c0d57e5..5ba2bbc 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -11,7 +11,7 @@
    ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
    ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
    ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃ Minim… ┃ Maxi… ┃ Stand… ┃ Abso… ┃ Relat… ┃   Top ┃
-   ┃ n     ┃  Rate ┃  Delta ┃ Delta ┃  Delta ┃ Delta ┃ Devia… ┃ Devi… ┃ Devia… ┃ Chan… ┃
+   ┃ n     ┃  Rate ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃ Chan… ┃
    ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
    │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
    │       │       │        │       │        │       │        │       │        │    -> │
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
index 4b4140c..5570ad3 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -11,7 +11,7 @@
    ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
    ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
    ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃ Minim… ┃ Maxi… ┃ Stand… ┃ Abso… ┃ Relat… ┃   Top ┃
-   ┃ n     ┃  Rate ┃  Delta ┃ Delta ┃  Delta ┃ Delta ┃ Devia… ┃ Devi… ┃ Devia… ┃ Chan… ┃
+   ┃ n     ┃  Rate ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃ Chan… ┃
    ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
    │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
    │       │       │        │       │        │       │        │       │        │    -> │
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
index 0bf5291..12ca0fa 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,12 +20,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
-   ┃        ┃  Match ┃   Mean ┃ Median ┃ Minimum ┃ Maxim… ┃ Standa… ┃ Absol… ┃ Relati… ┃
-   ┃ Column ┃   Rate ┃  Delta ┃  Delta ┃   Delta ┃  Delta ┃ Deviat… ┃ Devia… ┃ Deviat… ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
-   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
-   │ status │ 80.00% │        │        │         │        │         │        │         │
-   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┓
+   ┃        ┃        ┃        ┃         ┃        ┃         ┃        ┃    Mean ┃   Mean ┃
+   ┃        ┃  Match ┃   Mean ┃  Median ┃ Minim… ┃ Maximum ┃ Stand… ┃ Absolu… ┃ Relat… ┃
+   ┃ Column ┃   Rate ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │       0 │      0 │       2 │ 0.8944 │     0.6 │   0.02 │
+   │ qty    │ 80.00% │    0.2 │       0 │      0 │       1 │ 0.4472 │     0.2 │   0.05 │
+   │ status │ 80.00% │        │         │        │         │        │         │        │
+   └────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
index 0bf5291..12ca0fa 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -20,12 +20,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
-   ┃        ┃  Match ┃   Mean ┃ Median ┃ Minimum ┃ Maxim… ┃ Standa… ┃ Absol… ┃ Relati… ┃
-   ┃ Column ┃   Rate ┃  Delta ┃  Delta ┃   Delta ┃  Delta ┃ Deviat… ┃ Devia… ┃ Deviat… ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
-   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
-   │ status │ 80.00% │        │        │         │        │         │        │         │
-   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┓
+   ┃        ┃        ┃        ┃         ┃        ┃         ┃        ┃    Mean ┃   Mean ┃
+   ┃        ┃  Match ┃   Mean ┃  Median ┃ Minim… ┃ Maximum ┃ Stand… ┃ Absolu… ┃ Relat… ┃
+   ┃ Column ┃   Rate ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │       0 │      0 │       2 │ 0.8944 │     0.6 │   0.02 │
+   │ qty    │ 80.00% │    0.2 │       0 │      0 │       1 │ 0.4472 │     0.2 │   0.05 │
+   │ status │ 80.00% │        │         │        │         │        │         │        │
+   └────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
index 3e5b24e..845e9c4 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,12 +8,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
-   ┃        ┃  Match ┃   Mean ┃ Median ┃ Minimum ┃ Maxim… ┃ Standa… ┃ Absol… ┃ Relati… ┃
-   ┃ Column ┃   Rate ┃  Delta ┃  Delta ┃   Delta ┃  Delta ┃ Deviat… ┃ Devia… ┃ Deviat… ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
-   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
-   │ status │ 80.00% │        │        │         │        │         │        │         │
-   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┓
+   ┃        ┃        ┃        ┃         ┃        ┃         ┃        ┃    Mean ┃   Mean ┃
+   ┃        ┃  Match ┃   Mean ┃  Median ┃ Minim… ┃ Maximum ┃ Stand… ┃ Absolu… ┃ Relat… ┃
+   ┃ Column ┃   Rate ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │       0 │      0 │       2 │ 0.8944 │     0.6 │   0.02 │
+   │ qty    │ 80.00% │    0.2 │       0 │      0 │       1 │ 0.4472 │     0.2 │   0.05 │
+   │ status │ 80.00% │        │         │        │         │        │         │        │
+   └────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
index 3e5b24e..845e9c4 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -8,12 +8,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
-   ┃        ┃  Match ┃   Mean ┃ Median ┃ Minimum ┃ Maxim… ┃ Standa… ┃ Absol… ┃ Relati… ┃
-   ┃ Column ┃   Rate ┃  Delta ┃  Delta ┃   Delta ┃  Delta ┃ Deviat… ┃ Devia… ┃ Deviat… ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
-   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
-   │ status │ 80.00% │        │        │         │        │         │        │         │
-   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┓
+   ┃        ┃        ┃        ┃         ┃        ┃         ┃        ┃    Mean ┃   Mean ┃
+   ┃        ┃  Match ┃   Mean ┃  Median ┃ Minim… ┃ Maximum ┃ Stand… ┃ Absolu… ┃ Relat… ┃
+   ┃ Column ┃   Rate ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │       0 │      0 │       2 │ 0.8944 │     0.6 │   0.02 │
+   │ qty    │ 80.00% │    0.2 │       0 │      0 │       1 │ 0.4472 │     0.2 │   0.05 │
+   │ status │ 80.00% │        │         │        │         │        │         │        │
+   └────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
index e51a097..177f97b 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -23,7 +23,7 @@
    ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
    ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
    ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃ Minim… ┃ Maxi… ┃ Stand… ┃ Abso… ┃ Relat… ┃   Top ┃
-   ┃ n     ┃  Rate ┃  Delta ┃ Delta ┃  Delta ┃ Delta ┃ Devia… ┃ Devi… ┃ Devia… ┃ Chan… ┃
+   ┃ n     ┃  Rate ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃ Chan… ┃
    ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
    │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
    │       │       │        │       │        │       │        │       │        │    -> │
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
index 6b0fcb3..0c684c1 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -23,7 +23,7 @@
    ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
    ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
    ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃ Minim… ┃ Maxi… ┃ Stand… ┃ Abso… ┃ Relat… ┃   Top ┃
-   ┃ n     ┃  Rate ┃  Delta ┃ Delta ┃  Delta ┃ Delta ┃ Devia… ┃ Devi… ┃ Devia… ┃ Chan… ┃
+   ┃ n     ┃  Rate ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃ Chan… ┃
    ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
    │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
    │       │       │        │       │        │       │        │       │        │    -> │
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
index 48b4417..435c332 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -11,7 +11,7 @@
    ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
    ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
    ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃ Minim… ┃ Maxi… ┃ Stand… ┃ Abso… ┃ Relat… ┃   Top ┃
-   ┃ n     ┃  Rate ┃  Delta ┃ Delta ┃  Delta ┃ Delta ┃ Devia… ┃ Devi… ┃ Devia… ┃ Chan… ┃
+   ┃ n     ┃  Rate ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃ Chan… ┃
    ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
    │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
    │       │       │        │       │        │       │        │       │        │    -> │
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
index c77a139..57f81d0 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -11,7 +11,7 @@
    ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
    ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
    ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃ Minim… ┃ Maxi… ┃ Stand… ┃ Abso… ┃ Relat… ┃   Top ┃
-   ┃ n     ┃  Rate ┃  Delta ┃ Delta ┃  Delta ┃ Delta ┃ Devia… ┃ Devi… ┃ Devia… ┃ Chan… ┃
+   ┃ n     ┃  Rate ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃ Chan… ┃
    ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
    │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
    │       │       │        │       │        │       │        │       │        │    -> │
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
index 0bf5291..12ca0fa 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,12 +20,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
-   ┃        ┃  Match ┃   Mean ┃ Median ┃ Minimum ┃ Maxim… ┃ Standa… ┃ Absol… ┃ Relati… ┃
-   ┃ Column ┃   Rate ┃  Delta ┃  Delta ┃   Delta ┃  Delta ┃ Deviat… ┃ Devia… ┃ Deviat… ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
-   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
-   │ status │ 80.00% │        │        │         │        │         │        │         │
-   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┓
+   ┃        ┃        ┃        ┃         ┃        ┃         ┃        ┃    Mean ┃   Mean ┃
+   ┃        ┃  Match ┃   Mean ┃  Median ┃ Minim… ┃ Maximum ┃ Stand… ┃ Absolu… ┃ Relat… ┃
+   ┃ Column ┃   Rate ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │       0 │      0 │       2 │ 0.8944 │     0.6 │   0.02 │
+   │ qty    │ 80.00% │    0.2 │       0 │      0 │       1 │ 0.4472 │     0.2 │   0.05 │
+   │ status │ 80.00% │        │         │        │         │        │         │        │
+   └────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
index 0bf5291..12ca0fa 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -20,12 +20,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
-   ┃        ┃  Match ┃   Mean ┃ Median ┃ Minimum ┃ Maxim… ┃ Standa… ┃ Absol… ┃ Relati… ┃
-   ┃ Column ┃   Rate ┃  Delta ┃  Delta ┃   Delta ┃  Delta ┃ Deviat… ┃ Devia… ┃ Deviat… ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
-   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
-   │ status │ 80.00% │        │        │         │        │         │        │         │
-   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┓
+   ┃        ┃        ┃        ┃         ┃        ┃         ┃        ┃    Mean ┃   Mean ┃
+   ┃        ┃  Match ┃   Mean ┃  Median ┃ Minim… ┃ Maximum ┃ Stand… ┃ Absolu… ┃ Relat… ┃
+   ┃ Column ┃   Rate ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │       0 │      0 │       2 │ 0.8944 │     0.6 │   0.02 │
+   │ qty    │ 80.00% │    0.2 │       0 │      0 │       1 │ 0.4472 │     0.2 │   0.05 │
+   │ status │ 80.00% │        │         │        │         │        │         │        │
+   └────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
index 3e5b24e..845e9c4 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,12 +8,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
-   ┃        ┃  Match ┃   Mean ┃ Median ┃ Minimum ┃ Maxim… ┃ Standa… ┃ Absol… ┃ Relati… ┃
-   ┃ Column ┃   Rate ┃  Delta ┃  Delta ┃   Delta ┃  Delta ┃ Deviat… ┃ Devia… ┃ Deviat… ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
-   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
-   │ status │ 80.00% │        │        │         │        │         │        │         │
-   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┓
+   ┃        ┃        ┃        ┃         ┃        ┃         ┃        ┃    Mean ┃   Mean ┃
+   ┃        ┃  Match ┃   Mean ┃  Median ┃ Minim… ┃ Maximum ┃ Stand… ┃ Absolu… ┃ Relat… ┃
+   ┃ Column ┃   Rate ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │       0 │      0 │       2 │ 0.8944 │     0.6 │   0.02 │
+   │ qty    │ 80.00% │    0.2 │       0 │      0 │       1 │ 0.4472 │     0.2 │   0.05 │
+   │ status │ 80.00% │        │         │        │         │        │         │        │
+   └────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
index 3e5b24e..845e9c4 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -8,12 +8,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
-   ┃        ┃  Match ┃   Mean ┃ Median ┃ Minimum ┃ Maxim… ┃ Standa… ┃ Absol… ┃ Relati… ┃
-   ┃ Column ┃   Rate ┃  Delta ┃  Delta ┃   Delta ┃  Delta ┃ Deviat… ┃ Devia… ┃ Deviat… ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
-   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
-   │ status │ 80.00% │        │        │         │        │         │        │         │
-   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┓
+   ┃        ┃        ┃        ┃         ┃        ┃         ┃        ┃    Mean ┃   Mean ┃
+   ┃        ┃  Match ┃   Mean ┃  Median ┃ Minim… ┃ Maximum ┃ Stand… ┃ Absolu… ┃ Relat… ┃
+   ┃ Column ┃   Rate ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃    Diff ┃   Diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │       0 │      0 │       2 │ 0.8944 │     0.6 │   0.02 │
+   │ qty    │ 80.00% │    0.2 │       0 │      0 │       1 │ 0.4472 │     0.2 │   0.05 │
+   │ status │ 80.00% │        │         │        │         │        │         │        │
+   └────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
index e51a097..177f97b 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -23,7 +23,7 @@
    ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
    ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
    ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃ Minim… ┃ Maxi… ┃ Stand… ┃ Abso… ┃ Relat… ┃   Top ┃
-   ┃ n     ┃  Rate ┃  Delta ┃ Delta ┃  Delta ┃ Delta ┃ Devia… ┃ Devi… ┃ Devia… ┃ Chan… ┃
+   ┃ n     ┃  Rate ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃ Chan… ┃
    ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
    │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
    │       │       │        │       │        │       │        │       │        │    -> │
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
index 6b0fcb3..0c684c1 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -23,7 +23,7 @@
    ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
    ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
    ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃ Minim… ┃ Maxi… ┃ Stand… ┃ Abso… ┃ Relat… ┃   Top ┃
-   ┃ n     ┃  Rate ┃  Delta ┃ Delta ┃  Delta ┃ Delta ┃ Devia… ┃ Devi… ┃ Devia… ┃ Chan… ┃
+   ┃ n     ┃  Rate ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃ Chan… ┃
    ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
    │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
    │       │       │        │       │        │       │        │       │        │    -> │
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
index 48b4417..435c332 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -11,7 +11,7 @@
    ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
    ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
    ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃ Minim… ┃ Maxi… ┃ Stand… ┃ Abso… ┃ Relat… ┃   Top ┃
-   ┃ n     ┃  Rate ┃  Delta ┃ Delta ┃  Delta ┃ Delta ┃ Devia… ┃ Devi… ┃ Devia… ┃ Chan… ┃
+   ┃ n     ┃  Rate ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃ Chan… ┃
    ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
    │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
    │       │       │        │       │        │       │        │       │        │    -> │
diff --git a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
index c77a139..57f81d0 100644
--- a/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -11,7 +11,7 @@
    ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
    ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
    ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃ Minim… ┃ Maxi… ┃ Stand… ┃ Abso… ┃ Relat… ┃   Top ┃
-   ┃ n     ┃  Rate ┃  Delta ┃ Delta ┃  Delta ┃ Delta ┃ Devia… ┃ Devi… ┃ Devia… ┃ Chan… ┃
+   ┃ n     ┃  Rate ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃  Diff ┃   Diff ┃ Chan… ┃
    ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
    │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
    │       │       │        │       │        │       │        │       │        │    -> │
diff --git a/tests/summary/fixtures/metrics_long_labels/test_metrics_long_labels.py b/tests/summary/fixtures/metrics_long_labels/test_metrics_long_labels.py
index 1972e22..473b6f5 100644
--- a/tests/summary/fixtures/metrics_long_labels/test_metrics_long_labels.py
+++ b/tests/summary/fixtures/metrics_long_labels/test_metrics_long_labels.py
@@ -30,13 +30,13 @@ def test_generate() -> None:
     comp = compare_frames(left, right, primary_key=["id"])
     generate_summaries(
         comp,
-        metrics={
-            "Mean Delta": metrics.mean,
-            "Median Delta": metrics.median,
-            "Minimum Delta": metrics.min,
-            "Maximum Delta": metrics.max,
-            "Standard Deviation": metrics.std,
-            "Mean Absolute Deviation": metrics.mean_absolute_deviation,
-            "Mean Relative Deviation": metrics.mean_relative_deviation,
+        change_metrics={
+            "Mean Diff": metrics.change.mean,
+            "Median Diff": metrics.change.median,
+            "Minimum Diff": metrics.change.min,
+            "Maximum Diff": metrics.change.max,
+            "Standard Diff": metrics.change.std,
+            "Mean Absolute Diff": metrics.change.mean_absolute_deviation,
+            "Mean Relative Diff": metrics.change.mean_relative_deviation,
         },
     )
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
index f3d3d5f..a341946 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -5,24 +5,33 @@
 
  Schemas
  ▔▔▔▔▔▔▔
-   Schemas match exactly (column count: 3).
+   Schemas match exactly (column count: 4).
 
  Rows
  ▔▔▔▔
    Left count             Right count
        5      (no change)      5
 
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃                 Null% ┃ str_len_delta ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │ 20.0% -> 0.0% (-20.0) │               │
-   │ status │     40.00% │      │ 0.0% -> 40.0% (+40.0) │             0 │
-   └────────┴────────────┴──────┴───────────────────────┴───────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │
+   │ score  │      0.00% │      │  down │               │
+   │ status │     40.00% │      │       │             0 │
+   └────────┴────────────┴──────┴───────┴───────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
index f3d3d5f..a341946 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -5,24 +5,33 @@
 
  Schemas
  ▔▔▔▔▔▔▔
-   Schemas match exactly (column count: 3).
+   Schemas match exactly (column count: 4).
 
  Rows
  ▔▔▔▔
    Left count             Right count
        5      (no change)      5
 
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃                 Null% ┃ str_len_delta ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │ 20.0% -> 0.0% (-20.0) │               │
-   │ status │     40.00% │      │ 0.0% -> 40.0% (+40.0) │             0 │
-   └────────┴────────────┴──────┴───────────────────────┴───────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │
+   │ score  │      0.00% │      │  down │               │
+   │ status │     40.00% │      │       │             0 │
+   └────────┴────────────┴──────┴───────┴───────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
index 2f849f9..c197aaf 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -1,16 +1,25 @@
  Rows
  ▔▔▔▔
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃                 Null% ┃ str_len_delta ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │ 20.0% -> 0.0% (-20.0) │               │
-   │ status │     40.00% │      │ 0.0% -> 40.0% (+40.0) │             0 │
-   └────────┴────────────┴──────┴───────────────────────┴───────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │
+   │ score  │      0.00% │      │  down │               │
+   │ status │     40.00% │      │       │             0 │
+   └────────┴────────────┴──────┴───────┴───────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
index 2f849f9..c197aaf 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -1,16 +1,25 @@
  Rows
  ▔▔▔▔
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃                 Null% ┃ str_len_delta ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │ 20.0% -> 0.0% (-20.0) │               │
-   │ status │     40.00% │      │ 0.0% -> 40.0% (+40.0) │             0 │
-   └────────┴────────────┴──────┴───────────────────────┴───────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │
+   │ score  │      0.00% │      │  down │               │
+   │ status │     40.00% │      │       │             0 │
+   └────────┴────────────┴──────┴───────┴───────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
index 18568f4..11367dc 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -5,32 +5,42 @@
 
  Schemas
  ▔▔▔▔▔▔▔
-   Schemas match exactly (column count: 3).
+   Schemas match exactly (column count: 4).
 
  Rows
  ▔▔▔▔
    Left count             Right count
        5      (no change)      5
 
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃             Null% ┃ str_len_delta ┃      Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │     20.0% -> 0.0% │               │     None -> 30.0 │
-   │        │            │      │           (-20.0) │               │             (1x) │
-   │        │            │      │                   │               │     40.0 -> 42.0 │
-   │        │            │      │                   │               │             (1x) │
-   │        │            │      │                   │               │     20.0 -> 21.0 │
-   │        │            │      │                   │               │             (1x) │
-   ├────────┼────────────┼──────┼───────────────────┼───────────────┼──────────────────┤
-   │ status │     40.00% │      │     0.0% -> 40.0% │             0 │ "d" -> None (1x) │
-   │        │            │      │           (+40.0) │               │  "c" -> "x" (1x) │
-   │        │            │      │                   │               │ "b" -> None (1x) │
-   └────────┴────────────┴──────┴───────────────────┴───────────────┴──────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃       Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │ None -> 30.0 (1x) │
+   │        │            │      │       │               │ 40.0 -> 42.0 (1x) │
+   │        │            │      │       │               │ 20.0 -> 21.0 (1x) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────┤
+   │ score  │      0.00% │      │  down │               │  5.0 -> None (1x) │
+   │        │            │      │       │               │  4.0 -> None (1x) │
+   │        │            │      │       │               │  3.0 -> None (1x) │
+   │        │            │      │       │               │ (...and 2 others) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────┤
+   │ status │     40.00% │      │       │             0 │  "d" -> None (1x) │
+   │        │            │      │       │               │   "c" -> "x" (1x) │
+   │        │            │      │       │               │  "b" -> None (1x) │
+   └────────┴────────────┴──────┴───────┴───────────────┴───────────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
index f2a498b..52011d2 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -5,35 +5,42 @@
 
  Schemas
  ▔▔▔▔▔▔▔
-   Schemas match exactly (column count: 3).
+   Schemas match exactly (column count: 4).
 
  Rows
  ▔▔▔▔
    Left count             Right count
        5      (no change)      5
 
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃             Null% ┃ str_len_delta ┃      Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │     20.0% -> 0.0% │               │     None -> 30.0 │
-   │        │            │      │           (-20.0) │               │     (1x, e.g. 3) │
-   │        │            │      │                   │               │     40.0 -> 42.0 │
-   │        │            │      │                   │               │     (1x, e.g. 4) │
-   │        │            │      │                   │               │     20.0 -> 21.0 │
-   │        │            │      │                   │               │     (1x, e.g. 2) │
-   ├────────┼────────────┼──────┼───────────────────┼───────────────┼──────────────────┤
-   │ status │     40.00% │      │     0.0% -> 40.0% │             0 │ "d" -> None (1x, │
-   │        │            │      │           (+40.0) │               │          e.g. 4) │
-   │        │            │      │                   │               │  "c" -> "x" (1x, │
-   │        │            │      │                   │               │          e.g. 3) │
-   │        │            │      │                   │               │ "b" -> None (1x, │
-   │        │            │      │                   │               │          e.g. 2) │
-   └────────┴────────────┴──────┴───────────────────┴───────────────┴──────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃               Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │ None -> 30.0 (1x, e.g. 3) │
+   │        │            │      │       │               │ 40.0 -> 42.0 (1x, e.g. 4) │
+   │        │            │      │       │               │ 20.0 -> 21.0 (1x, e.g. 2) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────────────┤
+   │ score  │      0.00% │      │  down │               │  5.0 -> None (1x, e.g. 5) │
+   │        │            │      │       │               │  4.0 -> None (1x, e.g. 4) │
+   │        │            │      │       │               │  3.0 -> None (1x, e.g. 3) │
+   │        │            │      │       │               │         (...and 2 others) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────────────┤
+   │ status │     40.00% │      │       │             0 │  "d" -> None (1x, e.g. 4) │
+   │        │            │      │       │               │   "c" -> "x" (1x, e.g. 3) │
+   │        │            │      │       │               │  "b" -> None (1x, e.g. 2) │
+   └────────┴────────────┴──────┴───────┴───────────────┴───────────────────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
index 06d07fe..f74f9a2 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -1,24 +1,34 @@
  Rows
  ▔▔▔▔
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃             Null% ┃ str_len_delta ┃      Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │     20.0% -> 0.0% │               │     None -> 30.0 │
-   │        │            │      │           (-20.0) │               │             (1x) │
-   │        │            │      │                   │               │     40.0 -> 42.0 │
-   │        │            │      │                   │               │             (1x) │
-   │        │            │      │                   │               │     20.0 -> 21.0 │
-   │        │            │      │                   │               │             (1x) │
-   ├────────┼────────────┼──────┼───────────────────┼───────────────┼──────────────────┤
-   │ status │     40.00% │      │     0.0% -> 40.0% │             0 │ "d" -> None (1x) │
-   │        │            │      │           (+40.0) │               │  "c" -> "x" (1x) │
-   │        │            │      │                   │               │ "b" -> None (1x) │
-   └────────┴────────────┴──────┴───────────────────┴───────────────┴──────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃       Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │ None -> 30.0 (1x) │
+   │        │            │      │       │               │ 40.0 -> 42.0 (1x) │
+   │        │            │      │       │               │ 20.0 -> 21.0 (1x) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────┤
+   │ score  │      0.00% │      │  down │               │  5.0 -> None (1x) │
+   │        │            │      │       │               │  4.0 -> None (1x) │
+   │        │            │      │       │               │  3.0 -> None (1x) │
+   │        │            │      │       │               │ (...and 2 others) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────┤
+   │ status │     40.00% │      │       │             0 │  "d" -> None (1x) │
+   │        │            │      │       │               │   "c" -> "x" (1x) │
+   │        │            │      │       │               │  "b" -> None (1x) │
+   └────────┴────────────┴──────┴───────┴───────────────┴───────────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
index 01c654b..ae277d0 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -1,27 +1,34 @@
  Rows
  ▔▔▔▔
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃             Null% ┃ str_len_delta ┃      Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │     20.0% -> 0.0% │               │     None -> 30.0 │
-   │        │            │      │           (-20.0) │               │     (1x, e.g. 3) │
-   │        │            │      │                   │               │     40.0 -> 42.0 │
-   │        │            │      │                   │               │     (1x, e.g. 4) │
-   │        │            │      │                   │               │     20.0 -> 21.0 │
-   │        │            │      │                   │               │     (1x, e.g. 2) │
-   ├────────┼────────────┼──────┼───────────────────┼───────────────┼──────────────────┤
-   │ status │     40.00% │      │     0.0% -> 40.0% │             0 │ "d" -> None (1x, │
-   │        │            │      │           (+40.0) │               │          e.g. 4) │
-   │        │            │      │                   │               │  "c" -> "x" (1x, │
-   │        │            │      │                   │               │          e.g. 3) │
-   │        │            │      │                   │               │ "b" -> None (1x, │
-   │        │            │      │                   │               │          e.g. 2) │
-   └────────┴────────────┴──────┴───────────────────┴───────────────┴──────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃               Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │ None -> 30.0 (1x, e.g. 3) │
+   │        │            │      │       │               │ 40.0 -> 42.0 (1x, e.g. 4) │
+   │        │            │      │       │               │ 20.0 -> 21.0 (1x, e.g. 2) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────────────┤
+   │ score  │      0.00% │      │  down │               │  5.0 -> None (1x, e.g. 5) │
+   │        │            │      │       │               │  4.0 -> None (1x, e.g. 4) │
+   │        │            │      │       │               │  3.0 -> None (1x, e.g. 3) │
+   │        │            │      │       │               │         (...and 2 others) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────────────┤
+   │ status │     40.00% │      │       │             0 │  "d" -> None (1x, e.g. 4) │
+   │        │            │      │       │               │   "c" -> "x" (1x, e.g. 3) │
+   │        │            │      │       │               │  "b" -> None (1x, e.g. 2) │
+   └────────┴────────────┴──────┴───────┴───────────────┴───────────────────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
index f3d3d5f..a341946 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -5,24 +5,33 @@
 
  Schemas
  ▔▔▔▔▔▔▔
-   Schemas match exactly (column count: 3).
+   Schemas match exactly (column count: 4).
 
  Rows
  ▔▔▔▔
    Left count             Right count
        5      (no change)      5
 
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃                 Null% ┃ str_len_delta ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │ 20.0% -> 0.0% (-20.0) │               │
-   │ status │     40.00% │      │ 0.0% -> 40.0% (+40.0) │             0 │
-   └────────┴────────────┴──────┴───────────────────────┴───────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │
+   │ score  │      0.00% │      │  down │               │
+   │ status │     40.00% │      │       │             0 │
+   └────────┴────────────┴──────┴───────┴───────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
index f3d3d5f..a341946 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -5,24 +5,33 @@
 
  Schemas
  ▔▔▔▔▔▔▔
-   Schemas match exactly (column count: 3).
+   Schemas match exactly (column count: 4).
 
  Rows
  ▔▔▔▔
    Left count             Right count
        5      (no change)      5
 
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃                 Null% ┃ str_len_delta ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │ 20.0% -> 0.0% (-20.0) │               │
-   │ status │     40.00% │      │ 0.0% -> 40.0% (+40.0) │             0 │
-   └────────┴────────────┴──────┴───────────────────────┴───────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │
+   │ score  │      0.00% │      │  down │               │
+   │ status │     40.00% │      │       │             0 │
+   └────────┴────────────┴──────┴───────┴───────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
index 2f849f9..c197aaf 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -1,16 +1,25 @@
  Rows
  ▔▔▔▔
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃                 Null% ┃ str_len_delta ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │ 20.0% -> 0.0% (-20.0) │               │
-   │ status │     40.00% │      │ 0.0% -> 40.0% (+40.0) │             0 │
-   └────────┴────────────┴──────┴───────────────────────┴───────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │
+   │ score  │      0.00% │      │  down │               │
+   │ status │     40.00% │      │       │             0 │
+   └────────┴────────────┴──────┴───────┴───────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
index 2f849f9..c197aaf 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -1,16 +1,25 @@
  Rows
  ▔▔▔▔
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃                 Null% ┃ str_len_delta ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │ 20.0% -> 0.0% (-20.0) │               │
-   │ status │     40.00% │      │ 0.0% -> 40.0% (+40.0) │             0 │
-   └────────┴────────────┴──────┴───────────────────────┴───────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │
+   │ score  │      0.00% │      │  down │               │
+   │ status │     40.00% │      │       │             0 │
+   └────────┴────────────┴──────┴───────┴───────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
index 18568f4..11367dc 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -5,32 +5,42 @@
 
  Schemas
  ▔▔▔▔▔▔▔
-   Schemas match exactly (column count: 3).
+   Schemas match exactly (column count: 4).
 
  Rows
  ▔▔▔▔
    Left count             Right count
        5      (no change)      5
 
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃             Null% ┃ str_len_delta ┃      Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │     20.0% -> 0.0% │               │     None -> 30.0 │
-   │        │            │      │           (-20.0) │               │             (1x) │
-   │        │            │      │                   │               │     40.0 -> 42.0 │
-   │        │            │      │                   │               │             (1x) │
-   │        │            │      │                   │               │     20.0 -> 21.0 │
-   │        │            │      │                   │               │             (1x) │
-   ├────────┼────────────┼──────┼───────────────────┼───────────────┼──────────────────┤
-   │ status │     40.00% │      │     0.0% -> 40.0% │             0 │ "d" -> None (1x) │
-   │        │            │      │           (+40.0) │               │  "c" -> "x" (1x) │
-   │        │            │      │                   │               │ "b" -> None (1x) │
-   └────────┴────────────┴──────┴───────────────────┴───────────────┴──────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃       Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │ None -> 30.0 (1x) │
+   │        │            │      │       │               │ 40.0 -> 42.0 (1x) │
+   │        │            │      │       │               │ 20.0 -> 21.0 (1x) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────┤
+   │ score  │      0.00% │      │  down │               │  5.0 -> None (1x) │
+   │        │            │      │       │               │  4.0 -> None (1x) │
+   │        │            │      │       │               │  3.0 -> None (1x) │
+   │        │            │      │       │               │ (...and 2 others) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────┤
+   │ status │     40.00% │      │       │             0 │  "d" -> None (1x) │
+   │        │            │      │       │               │   "c" -> "x" (1x) │
+   │        │            │      │       │               │  "b" -> None (1x) │
+   └────────┴────────────┴──────┴───────┴───────────────┴───────────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
index f2a498b..52011d2 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -5,35 +5,42 @@
 
  Schemas
  ▔▔▔▔▔▔▔
-   Schemas match exactly (column count: 3).
+   Schemas match exactly (column count: 4).
 
  Rows
  ▔▔▔▔
    Left count             Right count
        5      (no change)      5
 
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃             Null% ┃ str_len_delta ┃      Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │     20.0% -> 0.0% │               │     None -> 30.0 │
-   │        │            │      │           (-20.0) │               │     (1x, e.g. 3) │
-   │        │            │      │                   │               │     40.0 -> 42.0 │
-   │        │            │      │                   │               │     (1x, e.g. 4) │
-   │        │            │      │                   │               │     20.0 -> 21.0 │
-   │        │            │      │                   │               │     (1x, e.g. 2) │
-   ├────────┼────────────┼──────┼───────────────────┼───────────────┼──────────────────┤
-   │ status │     40.00% │      │     0.0% -> 40.0% │             0 │ "d" -> None (1x, │
-   │        │            │      │           (+40.0) │               │          e.g. 4) │
-   │        │            │      │                   │               │  "c" -> "x" (1x, │
-   │        │            │      │                   │               │          e.g. 3) │
-   │        │            │      │                   │               │ "b" -> None (1x, │
-   │        │            │      │                   │               │          e.g. 2) │
-   └────────┴────────────┴──────┴───────────────────┴───────────────┴──────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃               Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │ None -> 30.0 (1x, e.g. 3) │
+   │        │            │      │       │               │ 40.0 -> 42.0 (1x, e.g. 4) │
+   │        │            │      │       │               │ 20.0 -> 21.0 (1x, e.g. 2) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────────────┤
+   │ score  │      0.00% │      │  down │               │  5.0 -> None (1x, e.g. 5) │
+   │        │            │      │       │               │  4.0 -> None (1x, e.g. 4) │
+   │        │            │      │       │               │  3.0 -> None (1x, e.g. 3) │
+   │        │            │      │       │               │         (...and 2 others) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────────────┤
+   │ status │     40.00% │      │       │             0 │  "d" -> None (1x, e.g. 4) │
+   │        │            │      │       │               │   "c" -> "x" (1x, e.g. 3) │
+   │        │            │      │       │               │  "b" -> None (1x, e.g. 2) │
+   └────────┴────────────┴──────┴───────┴───────────────┴───────────────────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
index 06d07fe..f74f9a2 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -1,24 +1,34 @@
  Rows
  ▔▔▔▔
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃             Null% ┃ str_len_delta ┃      Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │     20.0% -> 0.0% │               │     None -> 30.0 │
-   │        │            │      │           (-20.0) │               │             (1x) │
-   │        │            │      │                   │               │     40.0 -> 42.0 │
-   │        │            │      │                   │               │             (1x) │
-   │        │            │      │                   │               │     20.0 -> 21.0 │
-   │        │            │      │                   │               │             (1x) │
-   ├────────┼────────────┼──────┼───────────────────┼───────────────┼──────────────────┤
-   │ status │     40.00% │      │     0.0% -> 40.0% │             0 │ "d" -> None (1x) │
-   │        │            │      │           (+40.0) │               │  "c" -> "x" (1x) │
-   │        │            │      │                   │               │ "b" -> None (1x) │
-   └────────┴────────────┴──────┴───────────────────┴───────────────┴──────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃       Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │ None -> 30.0 (1x) │
+   │        │            │      │       │               │ 40.0 -> 42.0 (1x) │
+   │        │            │      │       │               │ 20.0 -> 21.0 (1x) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────┤
+   │ score  │      0.00% │      │  down │               │  5.0 -> None (1x) │
+   │        │            │      │       │               │  4.0 -> None (1x) │
+   │        │            │      │       │               │  3.0 -> None (1x) │
+   │        │            │      │       │               │ (...and 2 others) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────┤
+   │ status │     40.00% │      │       │             0 │  "d" -> None (1x) │
+   │        │            │      │       │               │   "c" -> "x" (1x) │
+   │        │            │      │       │               │  "b" -> None (1x) │
+   └────────┴────────────┴──────┴───────┴───────────────┴───────────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
index 01c654b..ae277d0 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -1,27 +1,34 @@
  Rows
  ▔▔▔▔
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃             Null% ┃ str_len_delta ┃      Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │     20.0% -> 0.0% │               │     None -> 30.0 │
-   │        │            │      │           (-20.0) │               │     (1x, e.g. 3) │
-   │        │            │      │                   │               │     40.0 -> 42.0 │
-   │        │            │      │                   │               │     (1x, e.g. 4) │
-   │        │            │      │                   │               │     20.0 -> 21.0 │
-   │        │            │      │                   │               │     (1x, e.g. 2) │
-   ├────────┼────────────┼──────┼───────────────────┼───────────────┼──────────────────┤
-   │ status │     40.00% │      │     0.0% -> 40.0% │             0 │ "d" -> None (1x, │
-   │        │            │      │           (+40.0) │               │          e.g. 4) │
-   │        │            │      │                   │               │  "c" -> "x" (1x, │
-   │        │            │      │                   │               │          e.g. 3) │
-   │        │            │      │                   │               │ "b" -> None (1x, │
-   │        │            │      │                   │               │          e.g. 2) │
-   └────────┴────────────┴──────┴───────────────────┴───────────────┴──────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃               Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │ None -> 30.0 (1x, e.g. 3) │
+   │        │            │      │       │               │ 40.0 -> 42.0 (1x, e.g. 4) │
+   │        │            │      │       │               │ 20.0 -> 21.0 (1x, e.g. 2) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────────────┤
+   │ score  │      0.00% │      │  down │               │  5.0 -> None (1x, e.g. 5) │
+   │        │            │      │       │               │  4.0 -> None (1x, e.g. 4) │
+   │        │            │      │       │               │  3.0 -> None (1x, e.g. 3) │
+   │        │            │      │       │               │         (...and 2 others) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────────────┤
+   │ status │     40.00% │      │       │             0 │  "d" -> None (1x, e.g. 4) │
+   │        │            │      │       │               │   "c" -> "x" (1x, e.g. 3) │
+   │        │            │      │       │               │  "b" -> None (1x, e.g. 2) │
+   └────────┴────────────┴──────┴───────┴───────────────┴───────────────────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
index 3a2a43b..4cb5f94 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -5,24 +5,33 @@
 
  Schemas
  ▔▔▔▔▔▔▔
-   Schemas match exactly (column count: 3).
+   Schemas match exactly (column count: 4).
 
  Rows
  ▔▔▔▔
    Left count             Right count
        5      (no change)      5
 
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃                 Null% ┃ str_len_delta ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │ 20.0% -> 0.0% (-20.0) │               │
-   │ status │     40.00% │      │ 0.0% -> 40.0% (+40.0) │             0 │
-   └────────┴────────────┴──────┴───────────────────────┴───────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │
+   │ score  │      0.00% │      │  down │               │
+   │ status │     40.00% │      │       │             0 │
+   └────────┴────────────┴──────┴───────┴───────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
index 3a2a43b..4cb5f94 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -5,24 +5,33 @@
 
  Schemas
  ▔▔▔▔▔▔▔
-   Schemas match exactly (column count: 3).
+   Schemas match exactly (column count: 4).
 
  Rows
  ▔▔▔▔
    Left count             Right count
        5      (no change)      5
 
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃                 Null% ┃ str_len_delta ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │ 20.0% -> 0.0% (-20.0) │               │
-   │ status │     40.00% │      │ 0.0% -> 40.0% (+40.0) │             0 │
-   └────────┴────────────┴──────┴───────────────────────┴───────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │
+   │ score  │      0.00% │      │  down │               │
+   │ status │     40.00% │      │       │             0 │
+   └────────┴────────────┴──────┴───────┴───────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
index 1316f6b..dfda029 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -1,16 +1,25 @@
  Rows
  ▔▔▔▔
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃                 Null% ┃ str_len_delta ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │ 20.0% -> 0.0% (-20.0) │               │
-   │ status │     40.00% │      │ 0.0% -> 40.0% (+40.0) │             0 │
-   └────────┴────────────┴──────┴───────────────────────┴───────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │
+   │ score  │      0.00% │      │  down │               │
+   │ status │     40.00% │      │       │             0 │
+   └────────┴────────────┴──────┴───────┴───────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
index 1316f6b..dfda029 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -1,16 +1,25 @@
  Rows
  ▔▔▔▔
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃                 Null% ┃ str_len_delta ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │ 20.0% -> 0.0% (-20.0) │               │
-   │ status │     40.00% │      │ 0.0% -> 40.0% (+40.0) │             0 │
-   └────────┴────────────┴──────┴───────────────────────┴───────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │
+   │ score  │      0.00% │      │  down │               │
+   │ status │     40.00% │      │       │             0 │
+   └────────┴────────────┴──────┴───────┴───────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
index bdca125..ff3bcb9 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -5,32 +5,42 @@
 
  Schemas
  ▔▔▔▔▔▔▔
-   Schemas match exactly (column count: 3).
+   Schemas match exactly (column count: 4).
 
  Rows
  ▔▔▔▔
    Left count             Right count
        5      (no change)      5
 
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃             Null% ┃ str_len_delta ┃      Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │     20.0% -> 0.0% │               │     None -> 30.0 │
-   │        │            │      │           (-20.0) │               │             (1x) │
-   │        │            │      │                   │               │     40.0 -> 42.0 │
-   │        │            │      │                   │               │             (1x) │
-   │        │            │      │                   │               │     20.0 -> 21.0 │
-   │        │            │      │                   │               │             (1x) │
-   ├────────┼────────────┼──────┼───────────────────┼───────────────┼──────────────────┤
-   │ status │     40.00% │      │     0.0% -> 40.0% │             0 │ "d" -> None (1x) │
-   │        │            │      │           (+40.0) │               │  "c" -> "x" (1x) │
-   │        │            │      │                   │               │ "b" -> None (1x) │
-   └────────┴────────────┴──────┴───────────────────┴───────────────┴──────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃       Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │ None -> 30.0 (1x) │
+   │        │            │      │       │               │ 40.0 -> 42.0 (1x) │
+   │        │            │      │       │               │ 20.0 -> 21.0 (1x) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────┤
+   │ score  │      0.00% │      │  down │               │  5.0 -> None (1x) │
+   │        │            │      │       │               │  4.0 -> None (1x) │
+   │        │            │      │       │               │  3.0 -> None (1x) │
+   │        │            │      │       │               │ (...and 2 others) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────┤
+   │ status │     40.00% │      │       │             0 │  "d" -> None (1x) │
+   │        │            │      │       │               │   "c" -> "x" (1x) │
+   │        │            │      │       │               │  "b" -> None (1x) │
+   └────────┴────────────┴──────┴───────┴───────────────┴───────────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
index cdd7114..877050f 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -5,35 +5,42 @@
 
  Schemas
  ▔▔▔▔▔▔▔
-   Schemas match exactly (column count: 3).
+   Schemas match exactly (column count: 4).
 
  Rows
  ▔▔▔▔
    Left count             Right count
        5      (no change)      5
 
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃             Null% ┃ str_len_delta ┃      Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │     20.0% -> 0.0% │               │     None -> 30.0 │
-   │        │            │      │           (-20.0) │               │     (1x, e.g. 3) │
-   │        │            │      │                   │               │     40.0 -> 42.0 │
-   │        │            │      │                   │               │     (1x, e.g. 4) │
-   │        │            │      │                   │               │     20.0 -> 21.0 │
-   │        │            │      │                   │               │     (1x, e.g. 2) │
-   ├────────┼────────────┼──────┼───────────────────┼───────────────┼──────────────────┤
-   │ status │     40.00% │      │     0.0% -> 40.0% │             0 │ "d" -> None (1x, │
-   │        │            │      │           (+40.0) │               │          e.g. 4) │
-   │        │            │      │                   │               │  "c" -> "x" (1x, │
-   │        │            │      │                   │               │          e.g. 3) │
-   │        │            │      │                   │               │ "b" -> None (1x, │
-   │        │            │      │                   │               │          e.g. 2) │
-   └────────┴────────────┴──────┴───────────────────┴───────────────┴──────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃               Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │ None -> 30.0 (1x, e.g. 3) │
+   │        │            │      │       │               │ 40.0 -> 42.0 (1x, e.g. 4) │
+   │        │            │      │       │               │ 20.0 -> 21.0 (1x, e.g. 2) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────────────┤
+   │ score  │      0.00% │      │  down │               │  5.0 -> None (1x, e.g. 5) │
+   │        │            │      │       │               │  4.0 -> None (1x, e.g. 4) │
+   │        │            │      │       │               │  3.0 -> None (1x, e.g. 3) │
+   │        │            │      │       │               │         (...and 2 others) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────────────┤
+   │ status │     40.00% │      │       │             0 │  "d" -> None (1x, e.g. 4) │
+   │        │            │      │       │               │   "c" -> "x" (1x, e.g. 3) │
+   │        │            │      │       │               │  "b" -> None (1x, e.g. 2) │
+   └────────┴────────────┴──────┴───────┴───────────────┴───────────────────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
index 370a2d3..40f1837 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -1,24 +1,34 @@
  Rows
  ▔▔▔▔
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃             Null% ┃ str_len_delta ┃      Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │     20.0% -> 0.0% │               │     None -> 30.0 │
-   │        │            │      │           (-20.0) │               │             (1x) │
-   │        │            │      │                   │               │     40.0 -> 42.0 │
-   │        │            │      │                   │               │             (1x) │
-   │        │            │      │                   │               │     20.0 -> 21.0 │
-   │        │            │      │                   │               │             (1x) │
-   ├────────┼────────────┼──────┼───────────────────┼───────────────┼──────────────────┤
-   │ status │     40.00% │      │     0.0% -> 40.0% │             0 │ "d" -> None (1x) │
-   │        │            │      │           (+40.0) │               │  "c" -> "x" (1x) │
-   │        │            │      │                   │               │ "b" -> None (1x) │
-   └────────┴────────────┴──────┴───────────────────┴───────────────┴──────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃       Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │ None -> 30.0 (1x) │
+   │        │            │      │       │               │ 40.0 -> 42.0 (1x) │
+   │        │            │      │       │               │ 20.0 -> 21.0 (1x) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────┤
+   │ score  │      0.00% │      │  down │               │  5.0 -> None (1x) │
+   │        │            │      │       │               │  4.0 -> None (1x) │
+   │        │            │      │       │               │  3.0 -> None (1x) │
+   │        │            │      │       │               │ (...and 2 others) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────┤
+   │ status │     40.00% │      │       │             0 │  "d" -> None (1x) │
+   │        │            │      │       │               │   "c" -> "x" (1x) │
+   │        │            │      │       │               │  "b" -> None (1x) │
+   └────────┴────────────┴──────┴───────┴───────────────┴───────────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
index 4a10c0c..268937c 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -1,27 +1,34 @@
  Rows
  ▔▔▔▔
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃             Null% ┃ str_len_delta ┃      Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │     20.0% -> 0.0% │               │     None -> 30.0 │
-   │        │            │      │           (-20.0) │               │     (1x, e.g. 3) │
-   │        │            │      │                   │               │     40.0 -> 42.0 │
-   │        │            │      │                   │               │     (1x, e.g. 4) │
-   │        │            │      │                   │               │     20.0 -> 21.0 │
-   │        │            │      │                   │               │     (1x, e.g. 2) │
-   ├────────┼────────────┼──────┼───────────────────┼───────────────┼──────────────────┤
-   │ status │     40.00% │      │     0.0% -> 40.0% │             0 │ "d" -> None (1x, │
-   │        │            │      │           (+40.0) │               │          e.g. 4) │
-   │        │            │      │                   │               │  "c" -> "x" (1x, │
-   │        │            │      │                   │               │          e.g. 3) │
-   │        │            │      │                   │               │ "b" -> None (1x, │
-   │        │            │      │                   │               │          e.g. 2) │
-   └────────┴────────────┴──────┴───────────────────┴───────────────┴──────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃               Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │ None -> 30.0 (1x, e.g. 3) │
+   │        │            │      │       │               │ 40.0 -> 42.0 (1x, e.g. 4) │
+   │        │            │      │       │               │ 20.0 -> 21.0 (1x, e.g. 2) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────────────┤
+   │ score  │      0.00% │      │  down │               │  5.0 -> None (1x, e.g. 5) │
+   │        │            │      │       │               │  4.0 -> None (1x, e.g. 4) │
+   │        │            │      │       │               │  3.0 -> None (1x, e.g. 3) │
+   │        │            │      │       │               │         (...and 2 others) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────────────┤
+   │ status │     40.00% │      │       │             0 │  "d" -> None (1x, e.g. 4) │
+   │        │            │      │       │               │   "c" -> "x" (1x, e.g. 3) │
+   │        │            │      │       │               │  "b" -> None (1x, e.g. 2) │
+   └────────┴────────────┴──────┴───────┴───────────────┴───────────────────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
index 3a2a43b..4cb5f94 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -5,24 +5,33 @@
 
  Schemas
  ▔▔▔▔▔▔▔
-   Schemas match exactly (column count: 3).
+   Schemas match exactly (column count: 4).
 
  Rows
  ▔▔▔▔
    Left count             Right count
        5      (no change)      5
 
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃                 Null% ┃ str_len_delta ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │ 20.0% -> 0.0% (-20.0) │               │
-   │ status │     40.00% │      │ 0.0% -> 40.0% (+40.0) │             0 │
-   └────────┴────────────┴──────┴───────────────────────┴───────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │
+   │ score  │      0.00% │      │  down │               │
+   │ status │     40.00% │      │       │             0 │
+   └────────┴────────────┴──────┴───────┴───────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
index 3a2a43b..4cb5f94 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -5,24 +5,33 @@
 
  Schemas
  ▔▔▔▔▔▔▔
-   Schemas match exactly (column count: 3).
+   Schemas match exactly (column count: 4).
 
  Rows
  ▔▔▔▔
    Left count             Right count
        5      (no change)      5
 
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃                 Null% ┃ str_len_delta ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │ 20.0% -> 0.0% (-20.0) │               │
-   │ status │     40.00% │      │ 0.0% -> 40.0% (+40.0) │             0 │
-   └────────┴────────────┴──────┴───────────────────────┴───────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │
+   │ score  │      0.00% │      │  down │               │
+   │ status │     40.00% │      │       │             0 │
+   └────────┴────────────┴──────┴───────┴───────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
index 1316f6b..dfda029 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -1,16 +1,25 @@
  Rows
  ▔▔▔▔
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃                 Null% ┃ str_len_delta ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │ 20.0% -> 0.0% (-20.0) │               │
-   │ status │     40.00% │      │ 0.0% -> 40.0% (+40.0) │             0 │
-   └────────┴────────────┴──────┴───────────────────────┴───────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │
+   │ score  │      0.00% │      │  down │               │
+   │ status │     40.00% │      │       │             0 │
+   └────────┴────────────┴──────┴───────┴───────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
index 1316f6b..dfda029 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -1,16 +1,25 @@
  Rows
  ▔▔▔▔
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃                 Null% ┃ str_len_delta ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │ 20.0% -> 0.0% (-20.0) │               │
-   │ status │     40.00% │      │ 0.0% -> 40.0% (+40.0) │             0 │
-   └────────┴────────────┴──────┴───────────────────────┴───────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │
+   │ score  │      0.00% │      │  down │               │
+   │ status │     40.00% │      │       │             0 │
+   └────────┴────────────┴──────┴───────┴───────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
index bdca125..ff3bcb9 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -5,32 +5,42 @@
 
  Schemas
  ▔▔▔▔▔▔▔
-   Schemas match exactly (column count: 3).
+   Schemas match exactly (column count: 4).
 
  Rows
  ▔▔▔▔
    Left count             Right count
        5      (no change)      5
 
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃             Null% ┃ str_len_delta ┃      Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │     20.0% -> 0.0% │               │     None -> 30.0 │
-   │        │            │      │           (-20.0) │               │             (1x) │
-   │        │            │      │                   │               │     40.0 -> 42.0 │
-   │        │            │      │                   │               │             (1x) │
-   │        │            │      │                   │               │     20.0 -> 21.0 │
-   │        │            │      │                   │               │             (1x) │
-   ├────────┼────────────┼──────┼───────────────────┼───────────────┼──────────────────┤
-   │ status │     40.00% │      │     0.0% -> 40.0% │             0 │ "d" -> None (1x) │
-   │        │            │      │           (+40.0) │               │  "c" -> "x" (1x) │
-   │        │            │      │                   │               │ "b" -> None (1x) │
-   └────────┴────────────┴──────┴───────────────────┴───────────────┴──────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃       Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │ None -> 30.0 (1x) │
+   │        │            │      │       │               │ 40.0 -> 42.0 (1x) │
+   │        │            │      │       │               │ 20.0 -> 21.0 (1x) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────┤
+   │ score  │      0.00% │      │  down │               │  5.0 -> None (1x) │
+   │        │            │      │       │               │  4.0 -> None (1x) │
+   │        │            │      │       │               │  3.0 -> None (1x) │
+   │        │            │      │       │               │ (...and 2 others) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────┤
+   │ status │     40.00% │      │       │             0 │  "d" -> None (1x) │
+   │        │            │      │       │               │   "c" -> "x" (1x) │
+   │        │            │      │       │               │  "b" -> None (1x) │
+   └────────┴────────────┴──────┴───────┴───────────────┴───────────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
index cdd7114..877050f 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -5,35 +5,42 @@
 
  Schemas
  ▔▔▔▔▔▔▔
-   Schemas match exactly (column count: 3).
+   Schemas match exactly (column count: 4).
 
  Rows
  ▔▔▔▔
    Left count             Right count
        5      (no change)      5
 
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃             Null% ┃ str_len_delta ┃      Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │     20.0% -> 0.0% │               │     None -> 30.0 │
-   │        │            │      │           (-20.0) │               │     (1x, e.g. 3) │
-   │        │            │      │                   │               │     40.0 -> 42.0 │
-   │        │            │      │                   │               │     (1x, e.g. 4) │
-   │        │            │      │                   │               │     20.0 -> 21.0 │
-   │        │            │      │                   │               │     (1x, e.g. 2) │
-   ├────────┼────────────┼──────┼───────────────────┼───────────────┼──────────────────┤
-   │ status │     40.00% │      │     0.0% -> 40.0% │             0 │ "d" -> None (1x, │
-   │        │            │      │           (+40.0) │               │          e.g. 4) │
-   │        │            │      │                   │               │  "c" -> "x" (1x, │
-   │        │            │      │                   │               │          e.g. 3) │
-   │        │            │      │                   │               │ "b" -> None (1x, │
-   │        │            │      │                   │               │          e.g. 2) │
-   └────────┴────────────┴──────┴───────────────────┴───────────────┴──────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃               Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │ None -> 30.0 (1x, e.g. 3) │
+   │        │            │      │       │               │ 40.0 -> 42.0 (1x, e.g. 4) │
+   │        │            │      │       │               │ 20.0 -> 21.0 (1x, e.g. 2) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────────────┤
+   │ score  │      0.00% │      │  down │               │  5.0 -> None (1x, e.g. 5) │
+   │        │            │      │       │               │  4.0 -> None (1x, e.g. 4) │
+   │        │            │      │       │               │  3.0 -> None (1x, e.g. 3) │
+   │        │            │      │       │               │         (...and 2 others) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────────────┤
+   │ status │     40.00% │      │       │             0 │  "d" -> None (1x, e.g. 4) │
+   │        │            │      │       │               │   "c" -> "x" (1x, e.g. 3) │
+   │        │            │      │       │               │  "b" -> None (1x, e.g. 2) │
+   └────────┴────────────┴──────┴───────┴───────────────┴───────────────────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
index 370a2d3..40f1837 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -1,24 +1,34 @@
  Rows
  ▔▔▔▔
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃             Null% ┃ str_len_delta ┃      Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │     20.0% -> 0.0% │               │     None -> 30.0 │
-   │        │            │      │           (-20.0) │               │             (1x) │
-   │        │            │      │                   │               │     40.0 -> 42.0 │
-   │        │            │      │                   │               │             (1x) │
-   │        │            │      │                   │               │     20.0 -> 21.0 │
-   │        │            │      │                   │               │             (1x) │
-   ├────────┼────────────┼──────┼───────────────────┼───────────────┼──────────────────┤
-   │ status │     40.00% │      │     0.0% -> 40.0% │             0 │ "d" -> None (1x) │
-   │        │            │      │           (+40.0) │               │  "c" -> "x" (1x) │
-   │        │            │      │                   │               │ "b" -> None (1x) │
-   └────────┴────────────┴──────┴───────────────────┴───────────────┴──────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃       Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │ None -> 30.0 (1x) │
+   │        │            │      │       │               │ 40.0 -> 42.0 (1x) │
+   │        │            │      │       │               │ 20.0 -> 21.0 (1x) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────┤
+   │ score  │      0.00% │      │  down │               │  5.0 -> None (1x) │
+   │        │            │      │       │               │  4.0 -> None (1x) │
+   │        │            │      │       │               │  3.0 -> None (1x) │
+   │        │            │      │       │               │ (...and 2 others) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────┤
+   │ status │     40.00% │      │       │             0 │  "d" -> None (1x) │
+   │        │            │      │       │               │   "c" -> "x" (1x) │
+   │        │            │      │       │               │  "b" -> None (1x) │
+   └────────┴────────────┴──────┴───────┴───────────────┴───────────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
index 4a10c0c..268937c 100644
--- a/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -1,27 +1,34 @@
  Rows
  ▔▔▔▔
-   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
-   ┃ │ │ │ │ ┃ = ┃ │ │ │ │ ┃  2  equal    (40.00%)  │
-   ┠─┼─┼─┼─┼─┨╌╌╌┠─┼─┼─┼─┼─┨╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌├╴  5  joined
-   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  3  unequal  (60.00%)  │
-   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
+   ┏━┯━┯━┯━┯━┓╌╌╌┏━┯━┯━┯━┯━┓╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╮
+   ┃ │ │ │ │ ┃ ≠ ┃ │ │ │ │ ┃  5  unequal  (100.00%)  │
+   ┗━┷━┷━┷━┷━┛╌╌╌┗━┷━┷━┷━┷━┛╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╯
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃             Null% ┃ str_len_delta ┃      Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━┩
-   │ price  │     40.00% │ 0.75 │     20.0% -> 0.0% │               │     None -> 30.0 │
-   │        │            │      │           (-20.0) │               │     (1x, e.g. 3) │
-   │        │            │      │                   │               │     40.0 -> 42.0 │
-   │        │            │      │                   │               │     (1x, e.g. 4) │
-   │        │            │      │                   │               │     20.0 -> 21.0 │
-   │        │            │      │                   │               │     (1x, e.g. 2) │
-   ├────────┼────────────┼──────┼───────────────────┼───────────────┼──────────────────┤
-   │ status │     40.00% │      │     0.0% -> 40.0% │             0 │ "d" -> None (1x, │
-   │        │            │      │           (+40.0) │               │          e.g. 4) │
-   │        │            │      │                   │               │  "c" -> "x" (1x, │
-   │        │            │      │                   │               │          e.g. 3) │
-   │        │            │      │                   │               │ "b" -> None (1x, │
-   │        │            │      │                   │               │          e.g. 2) │
-   └────────┴────────────┴──────┴───────────────────┴───────────────┴──────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean ┃ Trend ┃ str_len_delta ┃               Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     40.00% │ 0.75 │    up │               │ None -> 30.0 (1x, e.g. 3) │
+   │        │            │      │       │               │ 40.0 -> 42.0 (1x, e.g. 4) │
+   │        │            │      │       │               │ 20.0 -> 21.0 (1x, e.g. 2) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────────────┤
+   │ score  │      0.00% │      │  down │               │  5.0 -> None (1x, e.g. 5) │
+   │        │            │      │       │               │  4.0 -> None (1x, e.g. 4) │
+   │        │            │      │       │               │  3.0 -> None (1x, e.g. 3) │
+   │        │            │      │       │               │         (...and 2 others) │
+   ├────────┼────────────┼──────┼───────┼───────────────┼───────────────────────────┤
+   │ status │     40.00% │      │       │             0 │  "d" -> None (1x, e.g. 4) │
+   │        │            │      │       │               │   "c" -> "x" (1x, e.g. 3) │
+   │        │            │      │       │               │  "b" -> None (1x, e.g. 2) │
+   └────────┴────────────┴──────┴───────┴───────────────┴───────────────────────────┘
+
+ Data Inspection
+ ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
+   ┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━┓
+   ┃ Column ┃                   Null% ┃    Distinct ┃               Avg ┃    Max ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━┩
+   │ price  │   20.0% -> 0.0% (-20.0) │ 5 -> 5 (+0) │ 30 -> 30.6 (+0.6) │        │
+   │ score  │ 0.0% -> 100.0% (+100.0) │ 5 -> 1 (-4) │         3 -> None │        │
+   │ status │   0.0% -> 40.0% (+40.0) │ 5 -> 4 (-1) │                   │ e -> x │
+   └────────┴─────────────────────────┴─────────────┴───────────────────┴────────┘
diff --git a/tests/summary/fixtures/metrics_null_fraction/test_metrics_null_fraction.py b/tests/summary/fixtures/metrics_null_fraction/test_metrics_null_fraction.py
index 9e26bd4..a25bbf4 100644
--- a/tests/summary/fixtures/metrics_null_fraction/test_metrics_null_fraction.py
+++ b/tests/summary/fixtures/metrics_null_fraction/test_metrics_null_fraction.py
@@ -6,8 +6,8 @@
 import pytest
 
 from diffly import compare_frames, metrics
-from diffly.metrics import Metric
-from diffly.metrics.data import DEFAULT_DATA_METRICS
+from diffly.metrics.change import ChangeMetric
+from diffly.metrics.data import DEFAULT_DATA_METRICS, DataMetric
 from tests.utils import generate_summaries
 
 
@@ -17,6 +17,9 @@ def test_generate() -> None:
         {
             "id": [1, 2, 3, 4, 5],
             "price": [10.0, 20.0, None, 40.0, 50.0],
+            # `score` is fully populated on the left but entirely null on the right, so a
+            # numeric data metric yields a ``float -> None`` pair.
+            "score": [1.0, 2.0, 3.0, 4.0, 5.0],
             "status": ["a", "b", "c", "d", "e"],
         }
     )
@@ -24,22 +27,40 @@ def test_generate() -> None:
         {
             "id": [1, 2, 3, 4, 5],
             "price": [10.0, 21.0, 30.0, 42.0, 50.0],
+            "score": pl.Series([None] * 5, dtype=pl.Float64),
             "status": ["a", None, "x", None, "e"],
         }
     )
     comp = compare_frames(left, right, primary_key=["id"])
     generate_summaries(
         comp,
-        metrics={
+        change_metrics={
             # Numeric-only preset alongside a metric applied to all columns.
-            "Mean": metrics.mean,
-            "Null%": DEFAULT_DATA_METRICS["Null%"],
-            # A user-supplied metric with a custom (string-only) selector.
-            "str_len_delta": Metric(
+            "Mean": metrics.change.mean,
+            # A change metric returning a (non-numeric) string value.
+            "Trend": ChangeMetric(
+                fn=lambda left, right: (
+                    pl.when((right - left).mean() >= 0)
+                    .then(pl.lit("up"))
+                    .otherwise(pl.lit("down"))
+                ),
+            ),
+            # A user-supplied change metric with a custom (string-only) selector.
+            "str_len_delta": ChangeMetric(
                 fn=lambda left, right: (
                     right.str.len_chars() - left.str.len_chars()
                 ).mean(),
                 selector=cs.string(),
             ),
         },
+        data_metrics={
+            "Null%": DEFAULT_DATA_METRICS["Null%"],
+            # A second, numeric data metric to render more than one data column.
+            "Distinct": DataMetric(fn=lambda col: col.n_unique()),
+            # A numeric data metric without a custom formatter, so floats fall back to the
+            # default precision and a null side renders as ``None``.
+            "Avg": DataMetric(fn=lambda col: col.mean(), selector=cs.numeric()),
+            # A non-numeric data metric: rendered as ``left -> right`` without a delta.
+            "Max": DataMetric(fn=lambda col: col.max(), selector=cs.string()),
+        },
     )
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
index 93c45a8..46032f4 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,10 +20,10 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │
-   │ qty    │     80.00% │  0.2 │   1 │
-   │ status │     80.00% │      │     │
-   └────────┴────────────┴──────┴─────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │
+   │ qty    │     80.00% │       0.2 │        1 │
+   │ status │     80.00% │           │          │
+   └────────┴────────────┴───────────┴──────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
index 93c45a8..46032f4 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -20,10 +20,10 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │
-   │ qty    │     80.00% │  0.2 │   1 │
-   │ status │     80.00% │      │     │
-   └────────┴────────────┴──────┴─────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │
+   │ qty    │     80.00% │       0.2 │        1 │
+   │ status │     80.00% │           │          │
+   └────────┴────────────┴───────────┴──────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
index 8d4e5fc..ddcae53 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,10 +8,10 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │
-   │ qty    │     80.00% │  0.2 │   1 │
-   │ status │     80.00% │      │     │
-   └────────┴────────────┴──────┴─────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │
+   │ qty    │     80.00% │       0.2 │        1 │
+   │ status │     80.00% │           │          │
+   └────────┴────────────┴───────────┴──────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
index 8d4e5fc..ddcae53 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -8,10 +8,10 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │
-   │ qty    │     80.00% │  0.2 │   1 │
-   │ status │     80.00% │      │     │
-   └────────┴────────────┴──────┴─────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │
+   │ qty    │     80.00% │       0.2 │        1 │
+   │ status │     80.00% │           │          │
+   └────────┴────────────┴───────────┴──────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
index 78312e9..3e1aa3c 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,13 +20,13 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┳━━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃       Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━╇━━━━━━━━━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │ 40.0 -> 42.0 (1x) │
-   │        │            │      │     │ 20.0 -> 21.0 (1x) │
-   ├────────┼────────────┼──────┼─────┼───────────────────┤
-   │ qty    │     80.00% │  0.2 │   1 │       4 -> 5 (1x) │
-   ├────────┼────────────┼──────┼─────┼───────────────────┤
-   │ status │     80.00% │      │     │   "c" -> "x" (1x) │
-   └────────┴────────────┴──────┴─────┴───────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃       Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │ 40.0 -> 42.0 (1x) │
+   │        │            │           │          │ 20.0 -> 21.0 (1x) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────┤
+   │ qty    │     80.00% │       0.2 │        1 │       4 -> 5 (1x) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────┤
+   │ status │     80.00% │           │          │   "c" -> "x" (1x) │
+   └────────┴────────────┴───────────┴──────────┴───────────────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
index 3f8a229..981538a 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -20,13 +20,13 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃               Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │ 40.0 -> 42.0 (1x, e.g. 4) │
-   │        │            │      │     │ 20.0 -> 21.0 (1x, e.g. 2) │
-   ├────────┼────────────┼──────┼─────┼───────────────────────────┤
-   │ qty    │     80.00% │  0.2 │   1 │       4 -> 5 (1x, e.g. 4) │
-   ├────────┼────────────┼──────┼─────┼───────────────────────────┤
-   │ status │     80.00% │      │     │   "c" -> "x" (1x, e.g. 3) │
-   └────────┴────────────┴──────┴─────┴───────────────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃               Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │ 40.0 -> 42.0 (1x, e.g. 4) │
+   │        │            │           │          │ 20.0 -> 21.0 (1x, e.g. 2) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────────────┤
+   │ qty    │     80.00% │       0.2 │        1 │       4 -> 5 (1x, e.g. 4) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────────────┤
+   │ status │     80.00% │           │          │   "c" -> "x" (1x, e.g. 3) │
+   └────────┴────────────┴───────────┴──────────┴───────────────────────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
index 7218d6c..ea19692 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,13 +8,13 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┳━━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃       Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━╇━━━━━━━━━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │ 40.0 -> 42.0 (1x) │
-   │        │            │      │     │ 20.0 -> 21.0 (1x) │
-   ├────────┼────────────┼──────┼─────┼───────────────────┤
-   │ qty    │     80.00% │  0.2 │   1 │       4 -> 5 (1x) │
-   ├────────┼────────────┼──────┼─────┼───────────────────┤
-   │ status │     80.00% │      │     │   "c" -> "x" (1x) │
-   └────────┴────────────┴──────┴─────┴───────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃       Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │ 40.0 -> 42.0 (1x) │
+   │        │            │           │          │ 20.0 -> 21.0 (1x) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────┤
+   │ qty    │     80.00% │       0.2 │        1 │       4 -> 5 (1x) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────┤
+   │ status │     80.00% │           │          │   "c" -> "x" (1x) │
+   └────────┴────────────┴───────────┴──────────┴───────────────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
index 4c8c7ce..3b7d07d 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -8,13 +8,13 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃               Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │ 40.0 -> 42.0 (1x, e.g. 4) │
-   │        │            │      │     │ 20.0 -> 21.0 (1x, e.g. 2) │
-   ├────────┼────────────┼──────┼─────┼───────────────────────────┤
-   │ qty    │     80.00% │  0.2 │   1 │       4 -> 5 (1x, e.g. 4) │
-   ├────────┼────────────┼──────┼─────┼───────────────────────────┤
-   │ status │     80.00% │      │     │   "c" -> "x" (1x, e.g. 3) │
-   └────────┴────────────┴──────┴─────┴───────────────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃               Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │ 40.0 -> 42.0 (1x, e.g. 4) │
+   │        │            │           │          │ 20.0 -> 21.0 (1x, e.g. 2) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────────────┤
+   │ qty    │     80.00% │       0.2 │        1 │       4 -> 5 (1x, e.g. 4) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────────────┤
+   │ status │     80.00% │           │          │   "c" -> "x" (1x, e.g. 3) │
+   └────────┴────────────┴───────────┴──────────┴───────────────────────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
index 93c45a8..46032f4 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,10 +20,10 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │
-   │ qty    │     80.00% │  0.2 │   1 │
-   │ status │     80.00% │      │     │
-   └────────┴────────────┴──────┴─────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │
+   │ qty    │     80.00% │       0.2 │        1 │
+   │ status │     80.00% │           │          │
+   └────────┴────────────┴───────────┴──────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
index 93c45a8..46032f4 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -20,10 +20,10 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │
-   │ qty    │     80.00% │  0.2 │   1 │
-   │ status │     80.00% │      │     │
-   └────────┴────────────┴──────┴─────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │
+   │ qty    │     80.00% │       0.2 │        1 │
+   │ status │     80.00% │           │          │
+   └────────┴────────────┴───────────┴──────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
index 8d4e5fc..ddcae53 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,10 +8,10 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │
-   │ qty    │     80.00% │  0.2 │   1 │
-   │ status │     80.00% │      │     │
-   └────────┴────────────┴──────┴─────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │
+   │ qty    │     80.00% │       0.2 │        1 │
+   │ status │     80.00% │           │          │
+   └────────┴────────────┴───────────┴──────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
index 8d4e5fc..ddcae53 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -8,10 +8,10 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │
-   │ qty    │     80.00% │  0.2 │   1 │
-   │ status │     80.00% │      │     │
-   └────────┴────────────┴──────┴─────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │
+   │ qty    │     80.00% │       0.2 │        1 │
+   │ status │     80.00% │           │          │
+   └────────┴────────────┴───────────┴──────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
index 78312e9..3e1aa3c 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,13 +20,13 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┳━━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃       Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━╇━━━━━━━━━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │ 40.0 -> 42.0 (1x) │
-   │        │            │      │     │ 20.0 -> 21.0 (1x) │
-   ├────────┼────────────┼──────┼─────┼───────────────────┤
-   │ qty    │     80.00% │  0.2 │   1 │       4 -> 5 (1x) │
-   ├────────┼────────────┼──────┼─────┼───────────────────┤
-   │ status │     80.00% │      │     │   "c" -> "x" (1x) │
-   └────────┴────────────┴──────┴─────┴───────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃       Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │ 40.0 -> 42.0 (1x) │
+   │        │            │           │          │ 20.0 -> 21.0 (1x) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────┤
+   │ qty    │     80.00% │       0.2 │        1 │       4 -> 5 (1x) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────┤
+   │ status │     80.00% │           │          │   "c" -> "x" (1x) │
+   └────────┴────────────┴───────────┴──────────┴───────────────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
index 3f8a229..981538a 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -20,13 +20,13 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃               Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │ 40.0 -> 42.0 (1x, e.g. 4) │
-   │        │            │      │     │ 20.0 -> 21.0 (1x, e.g. 2) │
-   ├────────┼────────────┼──────┼─────┼───────────────────────────┤
-   │ qty    │     80.00% │  0.2 │   1 │       4 -> 5 (1x, e.g. 4) │
-   ├────────┼────────────┼──────┼─────┼───────────────────────────┤
-   │ status │     80.00% │      │     │   "c" -> "x" (1x, e.g. 3) │
-   └────────┴────────────┴──────┴─────┴───────────────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃               Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │ 40.0 -> 42.0 (1x, e.g. 4) │
+   │        │            │           │          │ 20.0 -> 21.0 (1x, e.g. 2) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────────────┤
+   │ qty    │     80.00% │       0.2 │        1 │       4 -> 5 (1x, e.g. 4) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────────────┤
+   │ status │     80.00% │           │          │   "c" -> "x" (1x, e.g. 3) │
+   └────────┴────────────┴───────────┴──────────┴───────────────────────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
index 7218d6c..ea19692 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,13 +8,13 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┳━━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃       Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━╇━━━━━━━━━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │ 40.0 -> 42.0 (1x) │
-   │        │            │      │     │ 20.0 -> 21.0 (1x) │
-   ├────────┼────────────┼──────┼─────┼───────────────────┤
-   │ qty    │     80.00% │  0.2 │   1 │       4 -> 5 (1x) │
-   ├────────┼────────────┼──────┼─────┼───────────────────┤
-   │ status │     80.00% │      │     │   "c" -> "x" (1x) │
-   └────────┴────────────┴──────┴─────┴───────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃       Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │ 40.0 -> 42.0 (1x) │
+   │        │            │           │          │ 20.0 -> 21.0 (1x) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────┤
+   │ qty    │     80.00% │       0.2 │        1 │       4 -> 5 (1x) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────┤
+   │ status │     80.00% │           │          │   "c" -> "x" (1x) │
+   └────────┴────────────┴───────────┴──────────┴───────────────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
index 4c8c7ce..3b7d07d 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -8,13 +8,13 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃               Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │ 40.0 -> 42.0 (1x, e.g. 4) │
-   │        │            │      │     │ 20.0 -> 21.0 (1x, e.g. 2) │
-   ├────────┼────────────┼──────┼─────┼───────────────────────────┤
-   │ qty    │     80.00% │  0.2 │   1 │       4 -> 5 (1x, e.g. 4) │
-   ├────────┼────────────┼──────┼─────┼───────────────────────────┤
-   │ status │     80.00% │      │     │   "c" -> "x" (1x, e.g. 3) │
-   └────────┴────────────┴──────┴─────┴───────────────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃               Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │ 40.0 -> 42.0 (1x, e.g. 4) │
+   │        │            │           │          │ 20.0 -> 21.0 (1x, e.g. 2) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────────────┤
+   │ qty    │     80.00% │       0.2 │        1 │       4 -> 5 (1x, e.g. 4) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────────────┤
+   │ status │     80.00% │           │          │   "c" -> "x" (1x, e.g. 3) │
+   └────────┴────────────┴───────────┴──────────┴───────────────────────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
index ee90b34..1b0247f 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,10 +20,10 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │
-   │ qty    │     80.00% │  0.2 │   1 │
-   │ status │     80.00% │      │     │
-   └────────┴────────────┴──────┴─────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │
+   │ qty    │     80.00% │       0.2 │        1 │
+   │ status │     80.00% │           │          │
+   └────────┴────────────┴───────────┴──────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
index ee90b34..1b0247f 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -20,10 +20,10 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │
-   │ qty    │     80.00% │  0.2 │   1 │
-   │ status │     80.00% │      │     │
-   └────────┴────────────┴──────┴─────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │
+   │ qty    │     80.00% │       0.2 │        1 │
+   │ status │     80.00% │           │          │
+   └────────┴────────────┴───────────┴──────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
index b106802..16a08ec 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,10 +8,10 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │
-   │ qty    │     80.00% │  0.2 │   1 │
-   │ status │     80.00% │      │     │
-   └────────┴────────────┴──────┴─────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │
+   │ qty    │     80.00% │       0.2 │        1 │
+   │ status │     80.00% │           │          │
+   └────────┴────────────┴───────────┴──────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
index b106802..16a08ec 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -8,10 +8,10 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │
-   │ qty    │     80.00% │  0.2 │   1 │
-   │ status │     80.00% │      │     │
-   └────────┴────────────┴──────┴─────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │
+   │ qty    │     80.00% │       0.2 │        1 │
+   │ status │     80.00% │           │          │
+   └────────┴────────────┴───────────┴──────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
index 43bd1a8..04d78f7 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,13 +20,13 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┳━━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃       Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━╇━━━━━━━━━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │ 40.0 -> 42.0 (1x) │
-   │        │            │      │     │ 20.0 -> 21.0 (1x) │
-   ├────────┼────────────┼──────┼─────┼───────────────────┤
-   │ qty    │     80.00% │  0.2 │   1 │       4 -> 5 (1x) │
-   ├────────┼────────────┼──────┼─────┼───────────────────┤
-   │ status │     80.00% │      │     │   "c" -> "x" (1x) │
-   └────────┴────────────┴──────┴─────┴───────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃       Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │ 40.0 -> 42.0 (1x) │
+   │        │            │           │          │ 20.0 -> 21.0 (1x) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────┤
+   │ qty    │     80.00% │       0.2 │        1 │       4 -> 5 (1x) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────┤
+   │ status │     80.00% │           │          │   "c" -> "x" (1x) │
+   └────────┴────────────┴───────────┴──────────┴───────────────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
index 67c851c..75445cf 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -20,13 +20,13 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃               Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │ 40.0 -> 42.0 (1x, e.g. 4) │
-   │        │            │      │     │ 20.0 -> 21.0 (1x, e.g. 2) │
-   ├────────┼────────────┼──────┼─────┼───────────────────────────┤
-   │ qty    │     80.00% │  0.2 │   1 │       4 -> 5 (1x, e.g. 4) │
-   ├────────┼────────────┼──────┼─────┼───────────────────────────┤
-   │ status │     80.00% │      │     │   "c" -> "x" (1x, e.g. 3) │
-   └────────┴────────────┴──────┴─────┴───────────────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃               Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │ 40.0 -> 42.0 (1x, e.g. 4) │
+   │        │            │           │          │ 20.0 -> 21.0 (1x, e.g. 2) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────────────┤
+   │ qty    │     80.00% │       0.2 │        1 │       4 -> 5 (1x, e.g. 4) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────────────┤
+   │ status │     80.00% │           │          │   "c" -> "x" (1x, e.g. 3) │
+   └────────┴────────────┴───────────┴──────────┴───────────────────────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
index 01d0278..709a290 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,13 +8,13 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┳━━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃       Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━╇━━━━━━━━━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │ 40.0 -> 42.0 (1x) │
-   │        │            │      │     │ 20.0 -> 21.0 (1x) │
-   ├────────┼────────────┼──────┼─────┼───────────────────┤
-   │ qty    │     80.00% │  0.2 │   1 │       4 -> 5 (1x) │
-   ├────────┼────────────┼──────┼─────┼───────────────────┤
-   │ status │     80.00% │      │     │   "c" -> "x" (1x) │
-   └────────┴────────────┴──────┴─────┴───────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃       Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │ 40.0 -> 42.0 (1x) │
+   │        │            │           │          │ 20.0 -> 21.0 (1x) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────┤
+   │ qty    │     80.00% │       0.2 │        1 │       4 -> 5 (1x) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────┤
+   │ status │     80.00% │           │          │   "c" -> "x" (1x) │
+   └────────┴────────────┴───────────┴──────────┴───────────────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
index e4f58e8..c55adc5 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -8,13 +8,13 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃               Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │ 40.0 -> 42.0 (1x, e.g. 4) │
-   │        │            │      │     │ 20.0 -> 21.0 (1x, e.g. 2) │
-   ├────────┼────────────┼──────┼─────┼───────────────────────────┤
-   │ qty    │     80.00% │  0.2 │   1 │       4 -> 5 (1x, e.g. 4) │
-   ├────────┼────────────┼──────┼─────┼───────────────────────────┤
-   │ status │     80.00% │      │     │   "c" -> "x" (1x, e.g. 3) │
-   └────────┴────────────┴──────┴─────┴───────────────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃               Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │ 40.0 -> 42.0 (1x, e.g. 4) │
+   │        │            │           │          │ 20.0 -> 21.0 (1x, e.g. 2) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────────────┤
+   │ qty    │     80.00% │       0.2 │        1 │       4 -> 5 (1x, e.g. 4) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────────────┤
+   │ status │     80.00% │           │          │   "c" -> "x" (1x, e.g. 3) │
+   └────────┴────────────┴───────────┴──────────┴───────────────────────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
index ee90b34..1b0247f 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,10 +20,10 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │
-   │ qty    │     80.00% │  0.2 │   1 │
-   │ status │     80.00% │      │     │
-   └────────┴────────────┴──────┴─────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │
+   │ qty    │     80.00% │       0.2 │        1 │
+   │ status │     80.00% │           │          │
+   └────────┴────────────┴───────────┴──────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
index ee90b34..1b0247f 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -20,10 +20,10 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │
-   │ qty    │     80.00% │  0.2 │   1 │
-   │ status │     80.00% │      │     │
-   └────────┴────────────┴──────┴─────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │
+   │ qty    │     80.00% │       0.2 │        1 │
+   │ status │     80.00% │           │          │
+   └────────┴────────────┴───────────┴──────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
index b106802..16a08ec 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,10 +8,10 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │
-   │ qty    │     80.00% │  0.2 │   1 │
-   │ status │     80.00% │      │     │
-   └────────┴────────────┴──────┴─────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │
+   │ qty    │     80.00% │       0.2 │        1 │
+   │ status │     80.00% │           │          │
+   └────────┴────────────┴───────────┴──────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
index b106802..16a08ec 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -8,10 +8,10 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │
-   │ qty    │     80.00% │  0.2 │   1 │
-   │ status │     80.00% │      │     │
-   └────────┴────────────┴──────┴─────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │
+   │ qty    │     80.00% │       0.2 │        1 │
+   │ status │     80.00% │           │          │
+   └────────┴────────────┴───────────┴──────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
index 43bd1a8..04d78f7 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,13 +20,13 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┳━━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃       Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━╇━━━━━━━━━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │ 40.0 -> 42.0 (1x) │
-   │        │            │      │     │ 20.0 -> 21.0 (1x) │
-   ├────────┼────────────┼──────┼─────┼───────────────────┤
-   │ qty    │     80.00% │  0.2 │   1 │       4 -> 5 (1x) │
-   ├────────┼────────────┼──────┼─────┼───────────────────┤
-   │ status │     80.00% │      │     │   "c" -> "x" (1x) │
-   └────────┴────────────┴──────┴─────┴───────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃       Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │ 40.0 -> 42.0 (1x) │
+   │        │            │           │          │ 20.0 -> 21.0 (1x) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────┤
+   │ qty    │     80.00% │       0.2 │        1 │       4 -> 5 (1x) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────┤
+   │ status │     80.00% │           │          │   "c" -> "x" (1x) │
+   └────────┴────────────┴───────────┴──────────┴───────────────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
index 67c851c..75445cf 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -20,13 +20,13 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃               Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │ 40.0 -> 42.0 (1x, e.g. 4) │
-   │        │            │      │     │ 20.0 -> 21.0 (1x, e.g. 2) │
-   ├────────┼────────────┼──────┼─────┼───────────────────────────┤
-   │ qty    │     80.00% │  0.2 │   1 │       4 -> 5 (1x, e.g. 4) │
-   ├────────┼────────────┼──────┼─────┼───────────────────────────┤
-   │ status │     80.00% │      │     │   "c" -> "x" (1x, e.g. 3) │
-   └────────┴────────────┴──────┴─────┴───────────────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃               Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │ 40.0 -> 42.0 (1x, e.g. 4) │
+   │        │            │           │          │ 20.0 -> 21.0 (1x, e.g. 2) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────────────┤
+   │ qty    │     80.00% │       0.2 │        1 │       4 -> 5 (1x, e.g. 4) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────────────┤
+   │ status │     80.00% │           │          │   "c" -> "x" (1x, e.g. 3) │
+   └────────┴────────────┴───────────┴──────────┴───────────────────────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
index 01d0278..709a290 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,13 +8,13 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┳━━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃       Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━╇━━━━━━━━━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │ 40.0 -> 42.0 (1x) │
-   │        │            │      │     │ 20.0 -> 21.0 (1x) │
-   ├────────┼────────────┼──────┼─────┼───────────────────┤
-   │ qty    │     80.00% │  0.2 │   1 │       4 -> 5 (1x) │
-   ├────────┼────────────┼──────┼─────┼───────────────────┤
-   │ status │     80.00% │      │     │   "c" -> "x" (1x) │
-   └────────┴────────────┴──────┴─────┴───────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃       Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │ 40.0 -> 42.0 (1x) │
+   │        │            │           │          │ 20.0 -> 21.0 (1x) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────┤
+   │ qty    │     80.00% │       0.2 │        1 │       4 -> 5 (1x) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────┤
+   │ status │     80.00% │           │          │   "c" -> "x" (1x) │
+   └────────┴────────────┴───────────┴──────────┴───────────────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
index e4f58e8..c55adc5 100644
--- a/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_presets_few/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -8,13 +8,13 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Max ┃               Top Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │   2 │ 40.0 -> 42.0 (1x, e.g. 4) │
-   │        │            │      │     │ 20.0 -> 21.0 (1x, e.g. 2) │
-   ├────────┼────────────┼──────┼─────┼───────────────────────────┤
-   │ qty    │     80.00% │  0.2 │   1 │       4 -> 5 (1x, e.g. 4) │
-   ├────────┼────────────┼──────┼─────┼───────────────────────────┤
-   │ status │     80.00% │      │     │   "c" -> "x" (1x, e.g. 3) │
-   └────────┴────────────┴──────┴─────┴───────────────────────────┘
+   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+   ┃ Column ┃ Match Rate ┃ Mean diff ┃ Max diff ┃               Top Changes ┃
+   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
+   │ price  │     60.00% │       0.6 │        2 │ 40.0 -> 42.0 (1x, e.g. 4) │
+   │        │            │           │          │ 20.0 -> 21.0 (1x, e.g. 2) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────────────┤
+   │ qty    │     80.00% │       0.2 │        1 │       4 -> 5 (1x, e.g. 4) │
+   ├────────┼────────────┼───────────┼──────────┼───────────────────────────┤
+   │ status │     80.00% │           │          │   "c" -> "x" (1x, e.g. 3) │
+   └────────┴────────────┴───────────┴──────────┴───────────────────────────┘
diff --git a/tests/summary/fixtures/metrics_presets_few/test_metrics_presets_few.py b/tests/summary/fixtures/metrics_presets_few/test_metrics_presets_few.py
index 4fcd6d1..e3955ef 100644
--- a/tests/summary/fixtures/metrics_presets_few/test_metrics_presets_few.py
+++ b/tests/summary/fixtures/metrics_presets_few/test_metrics_presets_few.py
@@ -29,5 +29,8 @@ def test_generate() -> None:
     comp = compare_frames(left, right, primary_key=["id"])
     generate_summaries(
         comp,
-        metrics={"Mean": metrics.mean, "Max": metrics.max},
+        change_metrics={
+            "Mean diff": metrics.change.mean,
+            "Max diff": metrics.change.max,
+        },
     )
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
index 5893689..385eba3 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,12 +20,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┓
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃       Mean ┃      Mean ┃
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃   absolute ┃  relative ┃
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃  deviation ┃ deviation ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │        0.6 │      0.02 │
-   │ qty    │     80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │        0.2 │      0.05 │
-   │ status │     80.00% │      │        │     │     │        │            │           │
-   └────────┴────────────┴──────┴────────┴─────┴─────┴────────┴────────────┴───────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
+   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
+   ┃        ┃  Match ┃   Mean ┃ Median ┃     Min ┃    Max ┃     Std ┃ absol… ┃ relati… ┃
+   ┃ Column ┃   Rate ┃   diff ┃   diff ┃    diff ┃   diff ┃    diff ┃   diff ┃    diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
+   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
+   │ status │ 80.00% │        │        │         │        │         │        │         │
+   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
index 5893689..385eba3 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -20,12 +20,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┓
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃       Mean ┃      Mean ┃
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃   absolute ┃  relative ┃
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃  deviation ┃ deviation ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │        0.6 │      0.02 │
-   │ qty    │     80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │        0.2 │      0.05 │
-   │ status │     80.00% │      │        │     │     │        │            │           │
-   └────────┴────────────┴──────┴────────┴─────┴─────┴────────┴────────────┴───────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
+   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
+   ┃        ┃  Match ┃   Mean ┃ Median ┃     Min ┃    Max ┃     Std ┃ absol… ┃ relati… ┃
+   ┃ Column ┃   Rate ┃   diff ┃   diff ┃    diff ┃   diff ┃    diff ┃   diff ┃    diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
+   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
+   │ status │ 80.00% │        │        │         │        │         │        │         │
+   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
index dc9a50a..9242da0 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,12 +8,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┓
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃       Mean ┃      Mean ┃
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃   absolute ┃  relative ┃
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃  deviation ┃ deviation ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │        0.6 │      0.02 │
-   │ qty    │     80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │        0.2 │      0.05 │
-   │ status │     80.00% │      │        │     │     │        │            │           │
-   └────────┴────────────┴──────┴────────┴─────┴─────┴────────┴────────────┴───────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
+   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
+   ┃        ┃  Match ┃   Mean ┃ Median ┃     Min ┃    Max ┃     Std ┃ absol… ┃ relati… ┃
+   ┃ Column ┃   Rate ┃   diff ┃   diff ┃    diff ┃   diff ┃    diff ┃   diff ┃    diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
+   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
+   │ status │ 80.00% │        │        │         │        │         │        │         │
+   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
index dc9a50a..9242da0 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -8,12 +8,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┓
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃       Mean ┃      Mean ┃
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃   absolute ┃  relative ┃
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃  deviation ┃ deviation ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │        0.6 │      0.02 │
-   │ qty    │     80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │        0.2 │      0.05 │
-   │ status │     80.00% │      │        │     │     │        │            │           │
-   └────────┴────────────┴──────┴────────┴─────┴─────┴────────┴────────────┴───────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
+   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
+   ┃        ┃  Match ┃   Mean ┃ Median ┃     Min ┃    Max ┃     Std ┃ absol… ┃ relati… ┃
+   ┃ Column ┃   Rate ┃   diff ┃   diff ┃    diff ┃   diff ┃    diff ┃   diff ┃    diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
+   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
+   │ status │ 80.00% │        │        │         │        │         │        │         │
+   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
index 0334464..3d8e920 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,22 +20,26 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃      ┃        ┃     ┃     ┃        ┃    Mean ┃   Mean ┃         ┃
-   ┃        ┃  Match ┃      ┃        ┃     ┃     ┃        ┃ absolu… ┃ relat… ┃     Top ┃
-   ┃ Column ┃   Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃ deviat… ┃ devia… ┃ Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │     0.6 │   0.02 │ 40.0 -> │
-   │        │        │      │        │     │     │        │         │        │    42.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   │        │        │      │        │     │     │        │         │        │ 20.0 -> │
-   │        │        │      │        │     │     │        │         │        │    21.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ qty    │ 80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │     0.2 │   0.05 │  4 -> 5 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ status │ 80.00% │      │        │     │     │        │         │        │  "c" -> │
-   │        │        │      │        │     │     │        │         │        │     "x" │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   └────────┴────────┴──────┴────────┴─────┴─────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
+   ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
+   ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃    Min ┃   Max ┃    Std ┃ abso… ┃ relat… ┃   Top ┃
+   ┃ n     ┃  Rate ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃ Chan… ┃
+   ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
+   │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  42.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   │       │       │        │       │        │       │        │       │        │  20.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  21.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ qty   │ 80.0… │    0.2 │     0 │      0 │     1 │ 0.4472 │   0.2 │   0.05 │  4 -> │
+   │       │       │        │       │        │       │        │       │        │     5 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ statu │ 80.0… │        │       │        │       │        │       │        │   "c" │
+   │ s     │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │   "x" │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   └───────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
index 2fd9096..a269734 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -20,26 +20,34 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃      ┃        ┃     ┃     ┃        ┃    Mean ┃   Mean ┃         ┃
-   ┃        ┃  Match ┃      ┃        ┃     ┃     ┃        ┃ absolu… ┃ relat… ┃     Top ┃
-   ┃ Column ┃   Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃ deviat… ┃ devia… ┃ Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │     0.6 │   0.02 │ 40.0 -> │
-   │        │        │      │        │     │     │        │         │        │    42.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 4) │
-   │        │        │      │        │     │     │        │         │        │ 20.0 -> │
-   │        │        │      │        │     │     │        │         │        │    21.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 2) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ qty    │ 80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │     0.2 │   0.05 │  4 -> 5 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 4) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ status │ 80.00% │      │        │     │     │        │         │        │  "c" -> │
-   │        │        │      │        │     │     │        │         │        │     "x" │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 3) │
-   └────────┴────────┴──────┴────────┴─────┴─────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
+   ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
+   ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃    Min ┃   Max ┃    Std ┃ abso… ┃ relat… ┃   Top ┃
+   ┃ n     ┃  Rate ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃ Chan… ┃
+   ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
+   │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  42.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    4) │
+   │       │       │        │       │        │       │        │       │        │  20.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  21.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    2) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ qty   │ 80.0… │    0.2 │     0 │      0 │     1 │ 0.4472 │   0.2 │   0.05 │  4 -> │
+   │       │       │        │       │        │       │        │       │        │     5 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    4) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ statu │ 80.0… │        │       │        │       │        │       │        │   "c" │
+   │ s     │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │   "x" │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    3) │
+   └───────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
index eb395dd..988afd1 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,22 +8,26 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃      ┃        ┃     ┃     ┃        ┃    Mean ┃   Mean ┃         ┃
-   ┃        ┃  Match ┃      ┃        ┃     ┃     ┃        ┃ absolu… ┃ relat… ┃     Top ┃
-   ┃ Column ┃   Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃ deviat… ┃ devia… ┃ Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │     0.6 │   0.02 │ 40.0 -> │
-   │        │        │      │        │     │     │        │         │        │    42.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   │        │        │      │        │     │     │        │         │        │ 20.0 -> │
-   │        │        │      │        │     │     │        │         │        │    21.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ qty    │ 80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │     0.2 │   0.05 │  4 -> 5 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ status │ 80.00% │      │        │     │     │        │         │        │  "c" -> │
-   │        │        │      │        │     │     │        │         │        │     "x" │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   └────────┴────────┴──────┴────────┴─────┴─────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
+   ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
+   ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃    Min ┃   Max ┃    Std ┃ abso… ┃ relat… ┃   Top ┃
+   ┃ n     ┃  Rate ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃ Chan… ┃
+   ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
+   │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  42.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   │       │       │        │       │        │       │        │       │        │  20.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  21.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ qty   │ 80.0… │    0.2 │     0 │      0 │     1 │ 0.4472 │   0.2 │   0.05 │  4 -> │
+   │       │       │        │       │        │       │        │       │        │     5 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ statu │ 80.0… │        │       │        │       │        │       │        │   "c" │
+   │ s     │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │   "x" │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   └───────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
index 31d7344..cb36645 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -8,26 +8,34 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃      ┃        ┃     ┃     ┃        ┃    Mean ┃   Mean ┃         ┃
-   ┃        ┃  Match ┃      ┃        ┃     ┃     ┃        ┃ absolu… ┃ relat… ┃     Top ┃
-   ┃ Column ┃   Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃ deviat… ┃ devia… ┃ Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │     0.6 │   0.02 │ 40.0 -> │
-   │        │        │      │        │     │     │        │         │        │    42.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 4) │
-   │        │        │      │        │     │     │        │         │        │ 20.0 -> │
-   │        │        │      │        │     │     │        │         │        │    21.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 2) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ qty    │ 80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │     0.2 │   0.05 │  4 -> 5 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 4) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ status │ 80.00% │      │        │     │     │        │         │        │  "c" -> │
-   │        │        │      │        │     │     │        │         │        │     "x" │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 3) │
-   └────────┴────────┴──────┴────────┴─────┴─────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
+   ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
+   ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃    Min ┃   Max ┃    Std ┃ abso… ┃ relat… ┃   Top ┃
+   ┃ n     ┃  Rate ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃ Chan… ┃
+   ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
+   │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  42.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    4) │
+   │       │       │        │       │        │       │        │       │        │  20.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  21.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    2) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ qty   │ 80.0… │    0.2 │     0 │      0 │     1 │ 0.4472 │   0.2 │   0.05 │  4 -> │
+   │       │       │        │       │        │       │        │       │        │     5 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    4) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ statu │ 80.0… │        │       │        │       │        │       │        │   "c" │
+   │ s     │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │   "x" │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    3) │
+   └───────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
index 5893689..385eba3 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,12 +20,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┓
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃       Mean ┃      Mean ┃
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃   absolute ┃  relative ┃
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃  deviation ┃ deviation ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │        0.6 │      0.02 │
-   │ qty    │     80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │        0.2 │      0.05 │
-   │ status │     80.00% │      │        │     │     │        │            │           │
-   └────────┴────────────┴──────┴────────┴─────┴─────┴────────┴────────────┴───────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
+   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
+   ┃        ┃  Match ┃   Mean ┃ Median ┃     Min ┃    Max ┃     Std ┃ absol… ┃ relati… ┃
+   ┃ Column ┃   Rate ┃   diff ┃   diff ┃    diff ┃   diff ┃    diff ┃   diff ┃    diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
+   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
+   │ status │ 80.00% │        │        │         │        │         │        │         │
+   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
index 5893689..385eba3 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -20,12 +20,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┓
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃       Mean ┃      Mean ┃
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃   absolute ┃  relative ┃
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃  deviation ┃ deviation ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │        0.6 │      0.02 │
-   │ qty    │     80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │        0.2 │      0.05 │
-   │ status │     80.00% │      │        │     │     │        │            │           │
-   └────────┴────────────┴──────┴────────┴─────┴─────┴────────┴────────────┴───────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
+   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
+   ┃        ┃  Match ┃   Mean ┃ Median ┃     Min ┃    Max ┃     Std ┃ absol… ┃ relati… ┃
+   ┃ Column ┃   Rate ┃   diff ┃   diff ┃    diff ┃   diff ┃    diff ┃   diff ┃    diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
+   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
+   │ status │ 80.00% │        │        │         │        │         │        │         │
+   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
index dc9a50a..9242da0 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,12 +8,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┓
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃       Mean ┃      Mean ┃
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃   absolute ┃  relative ┃
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃  deviation ┃ deviation ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │        0.6 │      0.02 │
-   │ qty    │     80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │        0.2 │      0.05 │
-   │ status │     80.00% │      │        │     │     │        │            │           │
-   └────────┴────────────┴──────┴────────┴─────┴─────┴────────┴────────────┴───────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
+   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
+   ┃        ┃  Match ┃   Mean ┃ Median ┃     Min ┃    Max ┃     Std ┃ absol… ┃ relati… ┃
+   ┃ Column ┃   Rate ┃   diff ┃   diff ┃    diff ┃   diff ┃    diff ┃   diff ┃    diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
+   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
+   │ status │ 80.00% │        │        │         │        │         │        │         │
+   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
index dc9a50a..9242da0 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -8,12 +8,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┓
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃       Mean ┃      Mean ┃
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃   absolute ┃  relative ┃
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃  deviation ┃ deviation ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │        0.6 │      0.02 │
-   │ qty    │     80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │        0.2 │      0.05 │
-   │ status │     80.00% │      │        │     │     │        │            │           │
-   └────────┴────────────┴──────┴────────┴─────┴─────┴────────┴────────────┴───────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
+   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
+   ┃        ┃  Match ┃   Mean ┃ Median ┃     Min ┃    Max ┃     Std ┃ absol… ┃ relati… ┃
+   ┃ Column ┃   Rate ┃   diff ┃   diff ┃    diff ┃   diff ┃    diff ┃   diff ┃    diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
+   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
+   │ status │ 80.00% │        │        │         │        │         │        │         │
+   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
index 0334464..3d8e920 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,22 +20,26 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃      ┃        ┃     ┃     ┃        ┃    Mean ┃   Mean ┃         ┃
-   ┃        ┃  Match ┃      ┃        ┃     ┃     ┃        ┃ absolu… ┃ relat… ┃     Top ┃
-   ┃ Column ┃   Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃ deviat… ┃ devia… ┃ Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │     0.6 │   0.02 │ 40.0 -> │
-   │        │        │      │        │     │     │        │         │        │    42.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   │        │        │      │        │     │     │        │         │        │ 20.0 -> │
-   │        │        │      │        │     │     │        │         │        │    21.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ qty    │ 80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │     0.2 │   0.05 │  4 -> 5 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ status │ 80.00% │      │        │     │     │        │         │        │  "c" -> │
-   │        │        │      │        │     │     │        │         │        │     "x" │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   └────────┴────────┴──────┴────────┴─────┴─────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
+   ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
+   ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃    Min ┃   Max ┃    Std ┃ abso… ┃ relat… ┃   Top ┃
+   ┃ n     ┃  Rate ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃ Chan… ┃
+   ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
+   │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  42.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   │       │       │        │       │        │       │        │       │        │  20.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  21.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ qty   │ 80.0… │    0.2 │     0 │      0 │     1 │ 0.4472 │   0.2 │   0.05 │  4 -> │
+   │       │       │        │       │        │       │        │       │        │     5 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ statu │ 80.0… │        │       │        │       │        │       │        │   "c" │
+   │ s     │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │   "x" │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   └───────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
index 2fd9096..a269734 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -20,26 +20,34 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃      ┃        ┃     ┃     ┃        ┃    Mean ┃   Mean ┃         ┃
-   ┃        ┃  Match ┃      ┃        ┃     ┃     ┃        ┃ absolu… ┃ relat… ┃     Top ┃
-   ┃ Column ┃   Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃ deviat… ┃ devia… ┃ Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │     0.6 │   0.02 │ 40.0 -> │
-   │        │        │      │        │     │     │        │         │        │    42.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 4) │
-   │        │        │      │        │     │     │        │         │        │ 20.0 -> │
-   │        │        │      │        │     │     │        │         │        │    21.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 2) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ qty    │ 80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │     0.2 │   0.05 │  4 -> 5 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 4) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ status │ 80.00% │      │        │     │     │        │         │        │  "c" -> │
-   │        │        │      │        │     │     │        │         │        │     "x" │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 3) │
-   └────────┴────────┴──────┴────────┴─────┴─────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
+   ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
+   ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃    Min ┃   Max ┃    Std ┃ abso… ┃ relat… ┃   Top ┃
+   ┃ n     ┃  Rate ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃ Chan… ┃
+   ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
+   │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  42.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    4) │
+   │       │       │        │       │        │       │        │       │        │  20.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  21.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    2) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ qty   │ 80.0… │    0.2 │     0 │      0 │     1 │ 0.4472 │   0.2 │   0.05 │  4 -> │
+   │       │       │        │       │        │       │        │       │        │     5 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    4) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ statu │ 80.0… │        │       │        │       │        │       │        │   "c" │
+   │ s     │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │   "x" │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    3) │
+   └───────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
index eb395dd..988afd1 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,22 +8,26 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃      ┃        ┃     ┃     ┃        ┃    Mean ┃   Mean ┃         ┃
-   ┃        ┃  Match ┃      ┃        ┃     ┃     ┃        ┃ absolu… ┃ relat… ┃     Top ┃
-   ┃ Column ┃   Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃ deviat… ┃ devia… ┃ Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │     0.6 │   0.02 │ 40.0 -> │
-   │        │        │      │        │     │     │        │         │        │    42.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   │        │        │      │        │     │     │        │         │        │ 20.0 -> │
-   │        │        │      │        │     │     │        │         │        │    21.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ qty    │ 80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │     0.2 │   0.05 │  4 -> 5 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ status │ 80.00% │      │        │     │     │        │         │        │  "c" -> │
-   │        │        │      │        │     │     │        │         │        │     "x" │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   └────────┴────────┴──────┴────────┴─────┴─────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
+   ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
+   ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃    Min ┃   Max ┃    Std ┃ abso… ┃ relat… ┃   Top ┃
+   ┃ n     ┃  Rate ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃ Chan… ┃
+   ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
+   │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  42.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   │       │       │        │       │        │       │        │       │        │  20.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  21.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ qty   │ 80.0… │    0.2 │     0 │      0 │     1 │ 0.4472 │   0.2 │   0.05 │  4 -> │
+   │       │       │        │       │        │       │        │       │        │     5 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ statu │ 80.0… │        │       │        │       │        │       │        │   "c" │
+   │ s     │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │   "x" │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   └───────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
index 31d7344..cb36645 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -8,26 +8,34 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃      ┃        ┃     ┃     ┃        ┃    Mean ┃   Mean ┃         ┃
-   ┃        ┃  Match ┃      ┃        ┃     ┃     ┃        ┃ absolu… ┃ relat… ┃     Top ┃
-   ┃ Column ┃   Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃ deviat… ┃ devia… ┃ Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │     0.6 │   0.02 │ 40.0 -> │
-   │        │        │      │        │     │     │        │         │        │    42.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 4) │
-   │        │        │      │        │     │     │        │         │        │ 20.0 -> │
-   │        │        │      │        │     │     │        │         │        │    21.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 2) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ qty    │ 80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │     0.2 │   0.05 │  4 -> 5 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 4) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ status │ 80.00% │      │        │     │     │        │         │        │  "c" -> │
-   │        │        │      │        │     │     │        │         │        │     "x" │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 3) │
-   └────────┴────────┴──────┴────────┴─────┴─────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
+   ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
+   ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃    Min ┃   Max ┃    Std ┃ abso… ┃ relat… ┃   Top ┃
+   ┃ n     ┃  Rate ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃ Chan… ┃
+   ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
+   │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  42.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    4) │
+   │       │       │        │       │        │       │        │       │        │  20.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  21.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    2) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ qty   │ 80.0… │    0.2 │     0 │      0 │     1 │ 0.4472 │   0.2 │   0.05 │  4 -> │
+   │       │       │        │       │        │       │        │       │        │     5 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    4) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ statu │ 80.0… │        │       │        │       │        │       │        │   "c" │
+   │ s     │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │   "x" │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    3) │
+   └───────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
index 0acf593..0b6d778 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,12 +20,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┓
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃       Mean ┃      Mean ┃
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃   absolute ┃  relative ┃
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃  deviation ┃ deviation ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │        0.6 │      0.02 │
-   │ qty    │     80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │        0.2 │      0.05 │
-   │ status │     80.00% │      │        │     │     │        │            │           │
-   └────────┴────────────┴──────┴────────┴─────┴─────┴────────┴────────────┴───────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
+   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
+   ┃        ┃  Match ┃   Mean ┃ Median ┃     Min ┃    Max ┃     Std ┃ absol… ┃ relati… ┃
+   ┃ Column ┃   Rate ┃   diff ┃   diff ┃    diff ┃   diff ┃    diff ┃   diff ┃    diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
+   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
+   │ status │ 80.00% │        │        │         │        │         │        │         │
+   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
index 0acf593..0b6d778 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -20,12 +20,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┓
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃       Mean ┃      Mean ┃
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃   absolute ┃  relative ┃
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃  deviation ┃ deviation ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │        0.6 │      0.02 │
-   │ qty    │     80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │        0.2 │      0.05 │
-   │ status │     80.00% │      │        │     │     │        │            │           │
-   └────────┴────────────┴──────┴────────┴─────┴─────┴────────┴────────────┴───────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
+   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
+   ┃        ┃  Match ┃   Mean ┃ Median ┃     Min ┃    Max ┃     Std ┃ absol… ┃ relati… ┃
+   ┃ Column ┃   Rate ┃   diff ┃   diff ┃    diff ┃   diff ┃    diff ┃   diff ┃    diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
+   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
+   │ status │ 80.00% │        │        │         │        │         │        │         │
+   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
index 5510545..50e2b88 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,12 +8,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┓
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃       Mean ┃      Mean ┃
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃   absolute ┃  relative ┃
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃  deviation ┃ deviation ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │        0.6 │      0.02 │
-   │ qty    │     80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │        0.2 │      0.05 │
-   │ status │     80.00% │      │        │     │     │        │            │           │
-   └────────┴────────────┴──────┴────────┴─────┴─────┴────────┴────────────┴───────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
+   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
+   ┃        ┃  Match ┃   Mean ┃ Median ┃     Min ┃    Max ┃     Std ┃ absol… ┃ relati… ┃
+   ┃ Column ┃   Rate ┃   diff ┃   diff ┃    diff ┃   diff ┃    diff ┃   diff ┃    diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
+   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
+   │ status │ 80.00% │        │        │         │        │         │        │         │
+   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
index 5510545..50e2b88 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -8,12 +8,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┓
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃       Mean ┃      Mean ┃
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃   absolute ┃  relative ┃
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃  deviation ┃ deviation ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │        0.6 │      0.02 │
-   │ qty    │     80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │        0.2 │      0.05 │
-   │ status │     80.00% │      │        │     │     │        │            │           │
-   └────────┴────────────┴──────┴────────┴─────┴─────┴────────┴────────────┴───────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
+   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
+   ┃        ┃  Match ┃   Mean ┃ Median ┃     Min ┃    Max ┃     Std ┃ absol… ┃ relati… ┃
+   ┃ Column ┃   Rate ┃   diff ┃   diff ┃    diff ┃   diff ┃    diff ┃   diff ┃    diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
+   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
+   │ status │ 80.00% │        │        │         │        │         │        │         │
+   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
index ca13fa5..cbf10eb 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,22 +20,26 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃      ┃        ┃     ┃     ┃        ┃    Mean ┃   Mean ┃         ┃
-   ┃        ┃  Match ┃      ┃        ┃     ┃     ┃        ┃ absolu… ┃ relat… ┃     Top ┃
-   ┃ Column ┃   Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃ deviat… ┃ devia… ┃ Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │     0.6 │   0.02 │ 40.0 -> │
-   │        │        │      │        │     │     │        │         │        │    42.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   │        │        │      │        │     │     │        │         │        │ 20.0 -> │
-   │        │        │      │        │     │     │        │         │        │    21.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ qty    │ 80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │     0.2 │   0.05 │  4 -> 5 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ status │ 80.00% │      │        │     │     │        │         │        │  "c" -> │
-   │        │        │      │        │     │     │        │         │        │     "x" │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   └────────┴────────┴──────┴────────┴─────┴─────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
+   ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
+   ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃    Min ┃   Max ┃    Std ┃ abso… ┃ relat… ┃   Top ┃
+   ┃ n     ┃  Rate ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃ Chan… ┃
+   ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
+   │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  42.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   │       │       │        │       │        │       │        │       │        │  20.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  21.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ qty   │ 80.0… │    0.2 │     0 │      0 │     1 │ 0.4472 │   0.2 │   0.05 │  4 -> │
+   │       │       │        │       │        │       │        │       │        │     5 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ statu │ 80.0… │        │       │        │       │        │       │        │   "c" │
+   │ s     │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │   "x" │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   └───────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
index f07a09b..89fff5a 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -20,26 +20,34 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃      ┃        ┃     ┃     ┃        ┃    Mean ┃   Mean ┃         ┃
-   ┃        ┃  Match ┃      ┃        ┃     ┃     ┃        ┃ absolu… ┃ relat… ┃     Top ┃
-   ┃ Column ┃   Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃ deviat… ┃ devia… ┃ Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │     0.6 │   0.02 │ 40.0 -> │
-   │        │        │      │        │     │     │        │         │        │    42.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 4) │
-   │        │        │      │        │     │     │        │         │        │ 20.0 -> │
-   │        │        │      │        │     │     │        │         │        │    21.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 2) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ qty    │ 80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │     0.2 │   0.05 │  4 -> 5 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 4) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ status │ 80.00% │      │        │     │     │        │         │        │  "c" -> │
-   │        │        │      │        │     │     │        │         │        │     "x" │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 3) │
-   └────────┴────────┴──────┴────────┴─────┴─────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
+   ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
+   ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃    Min ┃   Max ┃    Std ┃ abso… ┃ relat… ┃   Top ┃
+   ┃ n     ┃  Rate ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃ Chan… ┃
+   ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
+   │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  42.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    4) │
+   │       │       │        │       │        │       │        │       │        │  20.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  21.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    2) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ qty   │ 80.0… │    0.2 │     0 │      0 │     1 │ 0.4472 │   0.2 │   0.05 │  4 -> │
+   │       │       │        │       │        │       │        │       │        │     5 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    4) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ statu │ 80.0… │        │       │        │       │        │       │        │   "c" │
+   │ s     │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │   "x" │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    3) │
+   └───────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
index 939f003..50672d0 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,22 +8,26 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃      ┃        ┃     ┃     ┃        ┃    Mean ┃   Mean ┃         ┃
-   ┃        ┃  Match ┃      ┃        ┃     ┃     ┃        ┃ absolu… ┃ relat… ┃     Top ┃
-   ┃ Column ┃   Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃ deviat… ┃ devia… ┃ Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │     0.6 │   0.02 │ 40.0 -> │
-   │        │        │      │        │     │     │        │         │        │    42.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   │        │        │      │        │     │     │        │         │        │ 20.0 -> │
-   │        │        │      │        │     │     │        │         │        │    21.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ qty    │ 80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │     0.2 │   0.05 │  4 -> 5 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ status │ 80.00% │      │        │     │     │        │         │        │  "c" -> │
-   │        │        │      │        │     │     │        │         │        │     "x" │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   └────────┴────────┴──────┴────────┴─────┴─────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
+   ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
+   ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃    Min ┃   Max ┃    Std ┃ abso… ┃ relat… ┃   Top ┃
+   ┃ n     ┃  Rate ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃ Chan… ┃
+   ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
+   │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  42.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   │       │       │        │       │        │       │        │       │        │  20.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  21.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ qty   │ 80.0… │    0.2 │     0 │      0 │     1 │ 0.4472 │   0.2 │   0.05 │  4 -> │
+   │       │       │        │       │        │       │        │       │        │     5 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ statu │ 80.0… │        │       │        │       │        │       │        │   "c" │
+   │ s     │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │   "x" │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   └───────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
index ae20da9..3ef93f2 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -8,26 +8,34 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃      ┃        ┃     ┃     ┃        ┃    Mean ┃   Mean ┃         ┃
-   ┃        ┃  Match ┃      ┃        ┃     ┃     ┃        ┃ absolu… ┃ relat… ┃     Top ┃
-   ┃ Column ┃   Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃ deviat… ┃ devia… ┃ Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │     0.6 │   0.02 │ 40.0 -> │
-   │        │        │      │        │     │     │        │         │        │    42.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 4) │
-   │        │        │      │        │     │     │        │         │        │ 20.0 -> │
-   │        │        │      │        │     │     │        │         │        │    21.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 2) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ qty    │ 80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │     0.2 │   0.05 │  4 -> 5 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 4) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ status │ 80.00% │      │        │     │     │        │         │        │  "c" -> │
-   │        │        │      │        │     │     │        │         │        │     "x" │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 3) │
-   └────────┴────────┴──────┴────────┴─────┴─────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
+   ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
+   ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃    Min ┃   Max ┃    Std ┃ abso… ┃ relat… ┃   Top ┃
+   ┃ n     ┃  Rate ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃ Chan… ┃
+   ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
+   │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  42.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    4) │
+   │       │       │        │       │        │       │        │       │        │  20.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  21.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    2) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ qty   │ 80.0… │    0.2 │     0 │      0 │     1 │ 0.4472 │   0.2 │   0.05 │  4 -> │
+   │       │       │        │       │        │       │        │       │        │     5 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    4) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ statu │ 80.0… │        │       │        │       │        │       │        │   "c" │
+   │ s     │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │   "x" │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    3) │
+   └───────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
index 0acf593..0b6d778 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,12 +20,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┓
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃       Mean ┃      Mean ┃
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃   absolute ┃  relative ┃
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃  deviation ┃ deviation ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │        0.6 │      0.02 │
-   │ qty    │     80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │        0.2 │      0.05 │
-   │ status │     80.00% │      │        │     │     │        │            │           │
-   └────────┴────────────┴──────┴────────┴─────┴─────┴────────┴────────────┴───────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
+   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
+   ┃        ┃  Match ┃   Mean ┃ Median ┃     Min ┃    Max ┃     Std ┃ absol… ┃ relati… ┃
+   ┃ Column ┃   Rate ┃   diff ┃   diff ┃    diff ┃   diff ┃    diff ┃   diff ┃    diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
+   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
+   │ status │ 80.00% │        │        │         │        │         │        │         │
+   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
index 0acf593..0b6d778 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt
@@ -20,12 +20,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┓
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃       Mean ┃      Mean ┃
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃   absolute ┃  relative ┃
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃  deviation ┃ deviation ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │        0.6 │      0.02 │
-   │ qty    │     80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │        0.2 │      0.05 │
-   │ status │     80.00% │      │        │     │     │        │            │           │
-   └────────┴────────────┴──────┴────────┴─────┴─────┴────────┴────────────┴───────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
+   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
+   ┃        ┃  Match ┃   Mean ┃ Median ┃     Min ┃    Max ┃     Std ┃ absol… ┃ relati… ┃
+   ┃ Column ┃   Rate ┃   diff ┃   diff ┃    diff ┃   diff ┃    diff ┃   diff ┃    diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
+   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
+   │ status │ 80.00% │        │        │         │        │         │        │         │
+   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
index 5510545..50e2b88 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,12 +8,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┓
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃       Mean ┃      Mean ┃
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃   absolute ┃  relative ┃
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃  deviation ┃ deviation ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │        0.6 │      0.02 │
-   │ qty    │     80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │        0.2 │      0.05 │
-   │ status │     80.00% │      │        │     │     │        │            │           │
-   └────────┴────────────┴──────┴────────┴─────┴─────┴────────┴────────────┴───────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
+   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
+   ┃        ┃  Match ┃   Mean ┃ Median ┃     Min ┃    Max ┃     Std ┃ absol… ┃ relati… ┃
+   ┃ Column ┃   Rate ┃   diff ┃   diff ┃    diff ┃   diff ┃    diff ┃   diff ┃    diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
+   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
+   │ status │ 80.00% │        │        │         │        │         │        │         │
+   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
index 5510545..50e2b88 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt
@@ -8,12 +8,12 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━┓
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃       Mean ┃      Mean ┃
-   ┃        ┃            ┃      ┃        ┃     ┃     ┃        ┃   absolute ┃  relative ┃
-   ┃ Column ┃ Match Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃  deviation ┃ deviation ┃
-   ┡━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━┩
-   │ price  │     60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │        0.6 │      0.02 │
-   │ qty    │     80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │        0.2 │      0.05 │
-   │ status │     80.00% │      │        │     │     │        │            │           │
-   └────────┴────────────┴──────┴────────┴─────┴─────┴────────┴────────────┴───────────┘
+   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
+   ┃        ┃        ┃        ┃        ┃         ┃        ┃         ┃   Mean ┃    Mean ┃
+   ┃        ┃  Match ┃   Mean ┃ Median ┃     Min ┃    Max ┃     Std ┃ absol… ┃ relati… ┃
+   ┃ Column ┃   Rate ┃   diff ┃   diff ┃    diff ┃   diff ┃    diff ┃   diff ┃    diff ┃
+   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
+   │ price  │ 60.00% │    0.6 │      0 │       0 │      2 │  0.8944 │    0.6 │    0.02 │
+   │ qty    │ 80.00% │    0.2 │      0 │       0 │      1 │  0.4472 │    0.2 │    0.05 │
+   │ status │ 80.00% │        │        │         │        │         │        │         │
+   └────────┴────────┴────────┴────────┴─────────┴────────┴─────────┴────────┴─────────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
index ca13fa5..cbf10eb 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt
@@ -20,22 +20,26 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃      ┃        ┃     ┃     ┃        ┃    Mean ┃   Mean ┃         ┃
-   ┃        ┃  Match ┃      ┃        ┃     ┃     ┃        ┃ absolu… ┃ relat… ┃     Top ┃
-   ┃ Column ┃   Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃ deviat… ┃ devia… ┃ Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │     0.6 │   0.02 │ 40.0 -> │
-   │        │        │      │        │     │     │        │         │        │    42.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   │        │        │      │        │     │     │        │         │        │ 20.0 -> │
-   │        │        │      │        │     │     │        │         │        │    21.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ qty    │ 80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │     0.2 │   0.05 │  4 -> 5 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ status │ 80.00% │      │        │     │     │        │         │        │  "c" -> │
-   │        │        │      │        │     │     │        │         │        │     "x" │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   └────────┴────────┴──────┴────────┴─────┴─────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
+   ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
+   ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃    Min ┃   Max ┃    Std ┃ abso… ┃ relat… ┃   Top ┃
+   ┃ n     ┃  Rate ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃ Chan… ┃
+   ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
+   │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  42.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   │       │       │        │       │        │       │        │       │        │  20.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  21.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ qty   │ 80.0… │    0.2 │     0 │      0 │     1 │ 0.4472 │   0.2 │   0.05 │  4 -> │
+   │       │       │        │       │        │       │        │       │        │     5 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ statu │ 80.0… │        │       │        │       │        │       │        │   "c" │
+   │ s     │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │   "x" │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   └───────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
index f07a09b..89fff5a 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt
@@ -20,26 +20,34 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃      ┃        ┃     ┃     ┃        ┃    Mean ┃   Mean ┃         ┃
-   ┃        ┃  Match ┃      ┃        ┃     ┃     ┃        ┃ absolu… ┃ relat… ┃     Top ┃
-   ┃ Column ┃   Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃ deviat… ┃ devia… ┃ Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │     0.6 │   0.02 │ 40.0 -> │
-   │        │        │      │        │     │     │        │         │        │    42.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 4) │
-   │        │        │      │        │     │     │        │         │        │ 20.0 -> │
-   │        │        │      │        │     │     │        │         │        │    21.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 2) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ qty    │ 80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │     0.2 │   0.05 │  4 -> 5 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 4) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ status │ 80.00% │      │        │     │     │        │         │        │  "c" -> │
-   │        │        │      │        │     │     │        │         │        │     "x" │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 3) │
-   └────────┴────────┴──────┴────────┴─────┴─────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
+   ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
+   ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃    Min ┃   Max ┃    Std ┃ abso… ┃ relat… ┃   Top ┃
+   ┃ n     ┃  Rate ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃ Chan… ┃
+   ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
+   │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  42.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    4) │
+   │       │       │        │       │        │       │        │       │        │  20.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  21.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    2) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ qty   │ 80.0… │    0.2 │     0 │      0 │     1 │ 0.4472 │   0.2 │   0.05 │  4 -> │
+   │       │       │        │       │        │       │        │       │        │     5 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    4) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ statu │ 80.0… │        │       │        │       │        │       │        │   "c" │
+   │ s     │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │   "x" │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    3) │
+   └───────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
index 939f003..50672d0 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt
@@ -8,22 +8,26 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃      ┃        ┃     ┃     ┃        ┃    Mean ┃   Mean ┃         ┃
-   ┃        ┃  Match ┃      ┃        ┃     ┃     ┃        ┃ absolu… ┃ relat… ┃     Top ┃
-   ┃ Column ┃   Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃ deviat… ┃ devia… ┃ Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │     0.6 │   0.02 │ 40.0 -> │
-   │        │        │      │        │     │     │        │         │        │    42.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   │        │        │      │        │     │     │        │         │        │ 20.0 -> │
-   │        │        │      │        │     │     │        │         │        │    21.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ qty    │ 80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │     0.2 │   0.05 │  4 -> 5 │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ status │ 80.00% │      │        │     │     │        │         │        │  "c" -> │
-   │        │        │      │        │     │     │        │         │        │     "x" │
-   │        │        │      │        │     │     │        │         │        │    (1x) │
-   └────────┴────────┴──────┴────────┴─────┴─────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
+   ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
+   ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃    Min ┃   Max ┃    Std ┃ abso… ┃ relat… ┃   Top ┃
+   ┃ n     ┃  Rate ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃ Chan… ┃
+   ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
+   │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  42.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   │       │       │        │       │        │       │        │       │        │  20.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  21.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ qty   │ 80.0… │    0.2 │     0 │      0 │     1 │ 0.4472 │   0.2 │   0.05 │  4 -> │
+   │       │       │        │       │        │       │        │       │        │     5 │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ statu │ 80.0… │        │       │        │       │        │       │        │   "c" │
+   │ s     │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │   "x" │
+   │       │       │        │       │        │       │        │       │        │  (1x) │
+   └───────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
index ae20da9..3ef93f2 100644
--- a/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
+++ b/tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt
@@ -8,26 +8,34 @@
 
  Columns
  ▔▔▔▔▔▔▔
-   ┏━━━━━━━━┳━━━━━━━━┳━━━━━━┳━━━━━━━━┳━━━━━┳━━━━━┳━━━━━━━━┳━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
-   ┃        ┃        ┃      ┃        ┃     ┃     ┃        ┃    Mean ┃   Mean ┃         ┃
-   ┃        ┃  Match ┃      ┃        ┃     ┃     ┃        ┃ absolu… ┃ relat… ┃     Top ┃
-   ┃ Column ┃   Rate ┃ Mean ┃ Median ┃ Min ┃ Max ┃    Std ┃ deviat… ┃ devia… ┃ Changes ┃
-   ┡━━━━━━━━╇━━━━━━━━╇━━━━━━╇━━━━━━━━╇━━━━━╇━━━━━╇━━━━━━━━╇━━━━━━━━━╇━━━━━━━━╇━━━━━━━━━┩
-   │ price  │ 60.00% │  0.6 │      0 │   0 │   2 │ 0.8944 │     0.6 │   0.02 │ 40.0 -> │
-   │        │        │      │        │     │     │        │         │        │    42.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 4) │
-   │        │        │      │        │     │     │        │         │        │ 20.0 -> │
-   │        │        │      │        │     │     │        │         │        │    21.0 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 2) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ qty    │ 80.00% │  0.2 │      0 │   0 │   1 │ 0.4472 │     0.2 │   0.05 │  4 -> 5 │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 4) │
-   ├────────┼────────┼──────┼────────┼─────┼─────┼────────┼─────────┼────────┼─────────┤
-   │ status │ 80.00% │      │        │     │     │        │         │        │  "c" -> │
-   │        │        │      │        │     │     │        │         │        │     "x" │
-   │        │        │      │        │     │     │        │         │        │    (1x, │
-   │        │        │      │        │     │     │        │         │        │ e.g. 3) │
-   └────────┴────────┴──────┴────────┴─────┴─────┴────────┴─────────┴────────┴─────────┘
+   ┏━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━┓
+   ┃       ┃       ┃        ┃       ┃        ┃       ┃        ┃  Mean ┃   Mean ┃       ┃
+   ┃ Colum ┃ Match ┃   Mean ┃ Medi… ┃    Min ┃   Max ┃    Std ┃ abso… ┃ relat… ┃   Top ┃
+   ┃ n     ┃  Rate ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃  diff ┃   diff ┃ Chan… ┃
+   ┡━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━┩
+   │ price │ 60.0… │    0.6 │     0 │      0 │     2 │ 0.8944 │   0.6 │   0.02 │  40.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  42.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    4) │
+   │       │       │        │       │        │       │        │       │        │  20.0 │
+   │       │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │  21.0 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    2) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ qty   │ 80.0… │    0.2 │     0 │      0 │     1 │ 0.4472 │   0.2 │   0.05 │  4 -> │
+   │       │       │        │       │        │       │        │       │        │     5 │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    4) │
+   ├───────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┼────────┼───────┤
+   │ statu │ 80.0… │        │       │        │       │        │       │        │   "c" │
+   │ s     │       │        │       │        │       │        │       │        │    -> │
+   │       │       │        │       │        │       │        │       │        │   "x" │
+   │       │       │        │       │        │       │        │       │        │  (1x, │
+   │       │       │        │       │        │       │        │       │        │  e.g. │
+   │       │       │        │       │        │       │        │       │        │    3) │
+   └───────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┴────────┴───────┘
diff --git a/tests/summary/fixtures/metrics_presets_many/test_metrics_presets_many.py b/tests/summary/fixtures/metrics_presets_many/test_metrics_presets_many.py
index ede52cc..45e549c 100644
--- a/tests/summary/fixtures/metrics_presets_many/test_metrics_presets_many.py
+++ b/tests/summary/fixtures/metrics_presets_many/test_metrics_presets_many.py
@@ -29,13 +29,13 @@ def test_generate() -> None:
     comp = compare_frames(left, right, primary_key=["id"])
     generate_summaries(
         comp,
-        metrics={
-            "Mean": metrics.mean,
-            "Median": metrics.median,
-            "Min": metrics.min,
-            "Max": metrics.max,
-            "Std": metrics.std,
-            "Mean absolute deviation": metrics.mean_absolute_deviation,
-            "Mean relative deviation": metrics.mean_relative_deviation,
+        change_metrics={
+            "Mean diff": metrics.change.mean,
+            "Median diff": metrics.change.median,
+            "Min diff": metrics.change.min,
+            "Max diff": metrics.change.max,
+            "Std diff": metrics.change.std,
+            "Mean absolute diff": metrics.change.mean_absolute_deviation,
+            "Mean relative diff": metrics.change.mean_relative_deviation,
         },
     )
diff --git a/tests/summary/test_summary.py b/tests/summary/test_summary.py
index 6e43832..51fb047 100644
--- a/tests/summary/test_summary.py
+++ b/tests/summary/test_summary.py
@@ -13,6 +13,8 @@
 
 from diffly import compare_frames, metrics
 from diffly.comparison import DataFrameComparison
+from diffly.metrics.change import ChangeMetric, ChangeMetricFn
+from diffly.metrics.data import DEFAULT_DATA_METRICS, DataMetric, DataMetricFn
 from diffly.summary import _format_fraction_as_percentage, to_json_safe
 
 
@@ -181,7 +183,19 @@ def test_summary_data_parametrized(
     comp = _make_comparison()
     top_k = 3 if show_top_column_changes else 0
     hidden_columns = ["value"] if hide_value else None
-    metrics_arg = {"Mean": metrics.mean, "Max": metrics.max} if with_metrics else None
+    change_metrics_arg: dict[str, ChangeMetricFn | ChangeMetric] | None = (
+        {"Mean diff": metrics.change.mean, "Max diff": metrics.change.max}
+        if with_metrics
+        else None
+    )
+    data_metrics_arg: dict[str, DataMetricFn | DataMetric] | None = (
+        {
+            "Null%": DEFAULT_DATA_METRICS["Null%"],
+            "Data max": DataMetric(fn=lambda col: col.max()),
+        }
+        if with_metrics
+        else None
+    )
     summary = comp.summary(
         show_perfect_column_matches=show_perfect_column_matches,
         top_k_column_changes=top_k,
@@ -189,7 +203,8 @@ def test_summary_data_parametrized(
         show_sample_primary_key_per_change=sample_pk,
         slim=slim,
         hidden_columns=hidden_columns,
-        metrics=metrics_arg,
+        data_metrics=data_metrics_arg,
+        change_metrics=change_metrics_arg,
     )
     result = json.loads(summary.to_json())
 
@@ -228,7 +243,9 @@ def test_summary_data_parametrized(
             else None
         ),
         # Joined rows (id=1,2,3): value deltas = [0, 5, 0].
-        "metrics": {"Mean": pytest.approx(5 / 3), "Max": 5.0} if with_metrics else None,
+        "change_metrics": {"Mean diff": pytest.approx(5 / 3), "Max diff": 5.0}
+        if with_metrics
+        else None,
     }
     expected_columns = []
     if show_perfect_column_matches:
@@ -238,11 +255,40 @@ def test_summary_data_parametrized(
                 "match_rate": 1.0,
                 "n_total_changes": 0,
                 "changes": None,
-                "metrics": None,
+                "change_metrics": None,
             }
         )
     expected_columns.append(value_col)
 
+    # Data metrics land in the separate `data_inspection` section. Data metrics look at
+    # the full column, so "Data max" reflects the unjoined rows id=4 (left, 40.0) and id=5
+    # (right, 50.0) rather than the joined-rows max of 30.0. Hidden columns are skipped
+    # entirely, so hiding `value` drops it from the data inspection section too.
+    expected_data_inspection: list[dict] | None = None
+    if with_metrics:
+        expected_data_inspection = [
+            {
+                "name": "status",
+                "data_metrics": {
+                    "Null%": {"left": pytest.approx(0.0), "right": pytest.approx(0.0)},
+                    "Data max": {"left": "d", "right": "e"},
+                },
+            },
+        ]
+        if not hide_value:
+            expected_data_inspection.append(
+                {
+                    "name": "value",
+                    "data_metrics": {
+                        "Null%": {
+                            "left": pytest.approx(0.0),
+                            "right": pytest.approx(0.0),
+                        },
+                        "Data max": {"left": 40.0, "right": 50.0},
+                    },
+                }
+            )
+
     expected = {
         "equal": False,
         "left_name": "left",
@@ -258,6 +304,7 @@ def test_summary_data_parametrized(
             "n_right_only": 1,
         },
         "columns": expected_columns,
+        "data_inspection": expected_data_inspection,
         "sample_rows_left_only": [[4]] if sample_rows else None,
         "sample_rows_right_only": [[5]] if sample_rows else None,
     }
diff --git a/tests/test_metrics.py b/tests/test_metrics.py
index 27f5825..e141a31 100644
--- a/tests/test_metrics.py
+++ b/tests/test_metrics.py
@@ -8,7 +8,10 @@
 import pytest
 
 from diffly import metrics
-from diffly.metrics import MetricFn, data
+from diffly.comparison import _resolve_change_metric, _resolve_data_metric
+from diffly.metrics import data
+from diffly.metrics.change import ChangeMetric, ChangeMetricFn
+from diffly.metrics.data import DataMetric
 
 
 @pytest.fixture
@@ -17,29 +20,29 @@ def frame() -> pl.DataFrame:
     return pl.DataFrame({"l": [1, 2, 3, None], "r": [1, 2, 5, 4]})
 
 
-def _apply(metric: MetricFn, frame: pl.DataFrame) -> Any:
+def _apply(metric: ChangeMetricFn, frame: pl.DataFrame) -> Any:
     return frame.select(metric(pl.col("l"), pl.col("r"))).item()
 
 
 def test_mean(frame: pl.DataFrame) -> None:
-    assert _apply(metrics.mean, frame) == pytest.approx(2 / 3)
+    assert _apply(metrics.change.mean, frame) == pytest.approx(2 / 3)
 
 
 def test_median(frame: pl.DataFrame) -> None:
-    assert _apply(metrics.median, frame) == 0
+    assert _apply(metrics.change.median, frame) == 0
 
 
 def test_min(frame: pl.DataFrame) -> None:
-    assert _apply(metrics.min, frame) == 0
+    assert _apply(metrics.change.min, frame) == 0
 
 
 def test_max(frame: pl.DataFrame) -> None:
-    assert _apply(metrics.max, frame) == 2
+    assert _apply(metrics.change.max, frame) == 2
 
 
 def test_std(frame: pl.DataFrame) -> None:
     sample_mean = 2 / 3
-    assert _apply(metrics.std, frame) == pytest.approx(
+    assert _apply(metrics.change.std, frame) == pytest.approx(
         math.sqrt(
             ((0 - sample_mean) ** 2 + (0 - sample_mean) ** 2 + (2 - sample_mean) ** 2)
             / 2
@@ -50,54 +53,70 @@ def test_std(frame: pl.DataFrame) -> None:
 def test_mean_absolute_deviation() -> None:
     # deltas: [-1, 0, 2, null]; |deltas|: [1, 0, 2, null]; mean = 1.0
     frame = pl.DataFrame({"l": [2, 2, 3, None], "r": [1, 2, 5, 4]})
-    assert _apply(metrics.mean_absolute_deviation, frame) == pytest.approx(1.0)
+    assert _apply(metrics.change.mean_absolute_deviation, frame) == pytest.approx(1.0)
 
 
 def test_mean_relative_deviation() -> None:
     # left: [1, 2, 4, None]; delta: [0, 0, 2, null]; rel: [0, 0, 0.5, null]; mean = 1/6
     frame = pl.DataFrame({"l": [1, 2, 4, None], "r": [1, 2, 6, 4]})
-    assert _apply(metrics.mean_relative_deviation, frame) == pytest.approx(1 / 6)
+    assert _apply(metrics.change.mean_relative_deviation, frame) == pytest.approx(1 / 6)
 
 
 def test_mean_relative_deviation_div_by_zero() -> None:
     # Matches numpy: x/0 -> inf, so .abs().mean() -> inf
     frame = pl.DataFrame({"l": [0.0, 1.0], "r": [1.0, 1.0]})
-    assert math.isinf(_apply(metrics.mean_relative_deviation, frame))
+    assert math.isinf(_apply(metrics.change.mean_relative_deviation, frame))
 
 
-def test_null_fraction_change() -> None:
-    # left nulls: 1/4 = 25%; right nulls: 3/4 = 75%; delta = +50%
-    frame = pl.DataFrame({"l": [1, None, 3, 4], "r": [None, None, 3, None]})
-    assert _apply(data.null_fraction_change, frame) == "25.0% -> 75.0% (+50.0)"
+def test_null_fraction() -> None:
+    # A data metric describes a single side: 1 null out of 4 rows.
+    frame = pl.DataFrame({"l": [1, None, 3, 4]})
+    assert frame.select(data.null_fraction(pl.col("l"))).item() == pytest.approx(0.25)
 
 
-def test_null_fraction_change_negative_delta() -> None:
-    # left nulls: 1/2 = 50%; right nulls: 0%; delta = -50%
-    frame = pl.DataFrame({"l": [1, None], "r": [1, 2]})
-    assert _apply(data.null_fraction_change, frame) == "50.0% -> 0.0% (-50.0)"
-
-
-def test_null_fraction_change_non_numeric() -> None:
-    # Applies to any column type; here strings. left nulls: 0%; right nulls: 50%
-    frame = pl.DataFrame({"l": ["a", "b"], "r": ["a", None]})
-    assert _apply(data.null_fraction_change, frame) == "0.0% -> 50.0% (+50.0)"
+def test_null_fraction_non_numeric() -> None:
+    # Applies to any column type; here strings. 1 null out of 2 rows.
+    frame = pl.DataFrame({"l": ["a", None]})
+    assert frame.select(data.null_fraction(pl.col("l"))).item() == pytest.approx(0.5)
 
 
 def test_quantile(frame: pl.DataFrame) -> None:
     # deltas [0, 0, 2]: p50 = 0, p100 = 2
-    assert _apply(metrics.quantile(0.5), frame) == 0
-    assert _apply(metrics.quantile(1.0), frame) == 2
+    assert _apply(metrics.change.quantile(0.5), frame) == 0
+    assert _apply(metrics.change.quantile(1.0), frame) == 2
 
 
 def test_quantile_out_of_range() -> None:
     with pytest.raises(ValueError, match="q must be in"):
-        metrics.quantile(1.5)
+        metrics.change.quantile(1.5)
 
 
 def test_default_metrics_partition() -> None:
     from diffly.metrics import change
 
-    # The top-level defaults consist of the change metrics only.
-    assert metrics.DEFAULT_METRICS == {**change.DEFAULT_CHANGE_METRICS}
-    assert set(change.DEFAULT_CHANGE_METRICS) & set(data.DEFAULT_DATA_METRICS) == set()
-    assert list(metrics.DEFAULT_METRICS) == [*change.DEFAULT_CHANGE_METRICS]
+    # The change and data preset sets are disjoint.
+    assert set(change.DEFAULT_CHANGE_METRICS).isdisjoint(set(data.DEFAULT_DATA_METRICS))
+
+
+def test_resolve_data_metric_passthrough() -> None:
+    metric = DataMetric(fn=data.null_fraction)
+    assert _resolve_data_metric(metric) is metric
+
+
+def test_resolve_change_metric_passthrough() -> None:
+    metric = ChangeMetric(fn=metrics.change.mean)
+    assert _resolve_change_metric(metric) is metric
+
+
+def test_resolve_data_metric_wraps_callable() -> None:
+    fn = data.null_fraction
+    resolved = _resolve_data_metric(fn)
+    assert isinstance(resolved, DataMetric)
+    assert resolved.fn is fn
+
+
+def test_resolve_change_metric_wraps_callable() -> None:
+    fn = metrics.change.mean
+    resolved = _resolve_change_metric(fn)
+    assert isinstance(resolved, ChangeMetric)
+    assert resolved.fn is fn