feat: Add data metrics for numeric columns

[Moritz Potthoff (MoritzPotthoffQC)]

Motivation

Building on #43 and #47, we would like to provide a few more "data" metrics, this time for numeric columns only.

Changes

• Add new data metrics, similar to the change metrics

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a626117) to head (5cd68e1).

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #46   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        13           
  Lines         1127      1127           
=========================================
  Hits          1127      1127           

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[Copilot]

Pull request overview

Adds additional data metrics (computed per-side, then rendered as old -> new (delta)) for numeric columns, and updates summary rendering + golden fixtures to accommodate the expanded metric set.

Changes:

• Added new data-metric functions (mean_data, median_data, min_data, max_data, std_data) and expanded DEFAULT_DATA_METRICS.
• Updated summary table rendering to apply consistent overflow handling to metric columns.
• Updated tests, docs, and regenerated summary fixtures to reflect the new preset metrics/labels and the updated table layout.

Reviewed changes

Copilot reviewed 86 out of 86 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
diffly/metrics/data.py	Adds numeric “data” metrics and updates the data-metric presets/utilities.
diffly/summary.py	Applies consistent overflow behavior to metric columns in the Columns section.
docs/api/metrics.rst	Updates API docs to list the newly added data metrics and renamed null-fraction metric.
tests/test_metrics.py	Adds unit tests for new data metrics and renames null-fraction test targets.
tests/cli/test_cli.py	Updates CLI metric-selection test to use the new data-metric preset label.
tests/summary/fixtures/metrics_null_fraction/test_metrics_null_fraction.py	Updates fixture generator test to use the expanded data-metric preset set.
tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt	Golden fixture updated for new/wrapped metric headers.
tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for new/wrapped metric headers.
tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt	Golden fixture updated for new/wrapped metric headers.
tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt	Golden fixture updated for new/wrapped metric headers.
tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt	Golden fixture updated for new/wrapped metric headers.
tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for new/wrapped metric headers.
tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt	Golden fixture updated for new/wrapped metric headers.
tests/summary/fixtures/metrics_presets_many/gen/pretty_True_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt	Golden fixture updated for new/wrapped metric headers.
tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt	Golden fixture updated for new/wrapped metric headers.
tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for new/wrapped metric headers.
tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt	Golden fixture updated for new/wrapped metric headers.
tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt	Golden fixture updated for new/wrapped metric headers.
tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt	Golden fixture updated for new/wrapped metric headers.
tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for new/wrapped metric headers.
tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt	Golden fixture updated for new/wrapped metric headers.
tests/summary/fixtures/metrics_presets_many/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt	Golden fixture updated for new/wrapped metric headers.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_null_fraction/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt	Golden fixture updated for expanded data metrics in the Columns table.
tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_True_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_True_sample_pk_True.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_True_sample_pk_True.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_True_slim_False_sample_rows_False_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_True_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_True_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_True_top_False_slim_False_sample_rows_False_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_True_sample_pk_True.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_True_sample_pk_True.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_True_slim_False_sample_rows_False_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_True_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_True_sample_rows_False_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_True_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.
tests/summary/fixtures/metrics_long_labels/gen/pretty_False_perfect_False_top_False_slim_False_sample_rows_False_sample_pk_False.txt	Golden fixture updated for wrapped headers with long metric labels.

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[Copilot]

Pull request overview

Copilot reviewed 34 out of 34 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (1)

diffly/metrics/data.py:63

• The newly added preset data metrics (Mean/Median/Min/Max) don’t have direct unit-test coverage. tests/test_metrics.py currently tests only null_fraction for data metrics, and there are no assertions anywhere for DEFAULT_DATA_METRICS["Mean"|"Median"|"Min"|"Max"] evaluation/selector behavior. Adding a few small tests (e.g., for a numeric column with/without nulls) would protect these presets from regressions independently of summary fixture generation.

    "Mean": DataMetric(
        fn=lambda col: col.mean(),
        formatter=lambda value: f"{round(value, 2)}",
        selector=cs.numeric(),
    ),