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Preserve null lists when projecting a list of structs - #4129
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krishan711 wants to merge 6 commits into
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krishan711 wants to merge 6 commits into
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
rambleraptor
suggested changes
Oct 22, 2026
LargeListArray.from_arrays refuses a validity mask with sliced offsets, so a sliced large_list of structs raised. Rebase the offsets to start at 0 and slice the values to match, and test list and large_list, whole and sliced.
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@rambleraptor i see it: a sliced large_list of structs raised "Null bitmap with offsets slice not supported". rebased the offsets to start at 0 and sliced the values to match, and the test now covers list and large_list, whole and sliced. i hope this is what you were looking out for? if not please let me know i can dive deeper 👍 |
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@rambleraptor sorry for the ping, but any thoughts here? happy to update more if needed.. |
rambleraptor
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Nov 6, 2026
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PyArrow changes always scare me, but I think this looks correct. Thanks a lot!
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@krishan711 Can you resolve the merge conflicts? |
…of-structs * upstream/main: (78 commits) fix(io): keep null lists of structs when projecting Arrow data (apache#4065) Skip unknown nested fields when resolving Avro read schemas (apache#4289) fix(expressions): reject non-finite floats on conversion to Decimal (apache#4287) fix: handle negative-scale Decimals in increment, decrement and truncate_decimal (apache#4285) Match NaN partition values with `IsNaN` in partition predicates (apache#4281) Fix append when a data column is named like a partition helper column (apache#4344) Widen decimal literal precision in scan filters (apache#4348) Add row-lineage support with Spark tests (apache#3972) Serialize purgeRequested as a lowercase boolean in REST drop_table (apache#4341) Validate each branch against its own commits on retry (apache#4317) Core: Compare upsert rows column by column instead of cell by cell (apache#4334) Core: Write added files under the partition spec they were planned with (apache#4338) Core: Check whether a failed last commit attempt landed before cleanup (apache#4339) REST: Use the standard User-Agent format (apache#4330) SQL: Accept an existing SQLAlchemy engine in SqlCatalog (apache#4336) Expose catalog labels on Table (apache#4321) Respect REST endpoint capabilities when checking view existence (apache#4337) Reject existing ref names in create_branch and create_tag (apache#4319) Assert every ref a transaction writes, not just the first (apache#4315) feat: send Idempotency-Key on REST mutations when the server advertises it (apache#4310) ... # Conflicts: # pyiceberg/io/pyarrow.py # tests/io/test_pyarrow.py
Author
done. |
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Closing: the fix landed in #4065. |
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Rationale for this change
ArrowProjectionVisitor.listrebuilds a list of structs withLargeListArray.from_arrays(list_array.offsets, value_array). That drops the validity mask, so a null list is written as an empty list. This is the list version of #4118, which fixed the same thing for maps.The fix passes
mask=list_array.is_null().Are these changes tested?
Yes.
test__to_requested_schema_null_list_of_structscovers a full batch and a sliced one. It fails without the fix.test_null_list_and_mapasserted[[], [{"test": 1}]]forcol_list_with_struct, with a comment that it should be[None, [{"test": 1}]]once an Arrow issue was fixed. The null was lost by the rebuild here, not by Arrow:from_arrayswas given the offsets but not the validity, and a null list and an empty one share offsets. So the test now asserts[None, [{"test": 1}]].Are there any user-facing changes?
Null lists of structs stay null on write instead of becoming
[].