Core: Preserve empty partition bounds in inspect.manifests#3708
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fallintoplace
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ebyhr
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Jul 27, 2026
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| def test_inspect_manifests_preserves_empty_string_bounds(catalog: InMemoryCatalog) -> None: | ||
| schema = Schema(NestedField(1, "s", StringType(), required=False)) |
| schema = Schema(NestedField(1, "s", StringType(), required=False)) | ||
| spec = PartitionSpec(PartitionField(1, 1000, IdentityTransform(), "s")) | ||
| tbl = catalog.create_table("default.empty_string_partition", schema, partition_spec=spec) | ||
| tbl.append(pa.table({"s": [""]}, schema=pa.schema([pa.field("s", pa.large_string(), nullable=True)]))) |
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Rationale for this change
Manifest partition summaries encode string bounds as bytes. An empty string is represented by
b"", butInspectTable.manifests()checked encoded bounds by truthiness. As a result, valid empty-string lower and upper bounds were returned as null.This change checks whether each bound is absent instead, preserving empty values while continuing to return null for missing bounds. This matches Apache Iceberg Java's manifests metadata table.
Are these changes tested?
Yes. A regression test writes a table partitioned by an identity-transformed string containing an empty value and verifies that both manifest partition bounds remain empty strings.
The following checks pass locally:
PYTHONPATH=. uv run pytest tests/table/test_inspect.py -q(5 passed)PYTHONPATH=. uv run --extra datafusion --extra pyiceberg-core pytest -p no:cacheprovider tests/table -q(328 passed)make lintAre there any user-facing changes?
Yes.
table.inspect.manifests()now reports empty-string partition bounds as empty strings instead of null. There are no API changes.