Core: Preserve null operations in inspect.snapshots - #3707
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ebyhr
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Jul 31, 2026
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| def test_inspect_snapshots_preserves_null_operation(catalog: InMemoryCatalog) -> None: | ||
| schema = Schema(NestedField(1, "s", StringType(), required=False)) |
| def test_inspect_snapshots_preserves_null_operation(catalog: InMemoryCatalog) -> None: | ||
| schema = Schema(NestedField(1, "s", StringType(), required=False)) | ||
| tbl = catalog.create_table("default.snapshot_without_summary", schema) | ||
| tbl.append(pa.table({"s": ["value"]}, schema=pa.schema([pa.field("s", pa.large_string(), nullable=True)]))) |
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Rationale for this change
The
snapshotsmetadata table declaresoperationas nullable because snapshots without a summary do not have an operation. However,InspectTable.snapshots()converted the missing value withstr(None), returning the literal string"None"instead of null.This change passes the operation directly to PyArrow, preserving null semantics and matching Apache Iceberg Java's snapshots metadata table.
Are these changes tested?
Yes. A regression test creates a snapshot without a summary and verifies that
table.inspect.snapshots()returns a null operation.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 tests/table -q(328 passed)make lintAre there any user-facing changes?
Yes. For snapshots without a summary,
table.inspect.snapshots()now returns null in theoperationcolumn instead of the string"None". There are no API changes.