Fix duplicate filtering path in Arrow task batches#3448
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GayathriSrividya wants to merge 2 commits into
Open
Fix duplicate filtering path in Arrow task batches#3448GayathriSrividya wants to merge 2 commits into
GayathriSrividya wants to merge 2 commits into
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ebyhr
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Jun 1, 2026
Replace the two weak tests that passed on the unfixed code with proper regression coverage: 1. test_task_to_record_batches_does_not_use_table_filter_without_positional_deletes Replaces pyarrow.Table with a sentinel class whose from_batches raises AssertionError. A custom metaclass preserves isinstance checks so the rest of the code-path is unaffected. With the fix the sentinel is never reached; without the fix it fires immediately, detecting the old pa.Table.from_batches / filter / combine_chunks / to_batches[0] path that caused the SIGSEGV on Apple Silicon. 2. test_task_to_record_batches_filter_applied_after_positional_deletes Uses data [1,2,3,4,5] with positional deletes on positions 1 and 3 (removing values 2 and 4), then applies filter id > 2. Expected result [3, 5] would be wrong if either deletes or the subsequent filter were skipped.
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Closes #3272
What this changes
This PR updates the Arrow scan path in
_task_to_record_batchesto avoid redundant filtering when there are no positional deletes.Scanner.from_fragmentas the only filter path whenpositional_deletesis absent.current_batch.filter(pyarrow_filter)only in the positional-delete path, after deletes are applied.Why
The previous flow could perform an extra table-level refilter even when the scanner already applied the predicate. This change removes that stale workaround path while keeping correct behavior for positional delete scenarios.
Tests
Added regression coverage in
tests/io/test_pyarrow.py:test_task_to_record_batches_filter_without_positional_deletes_avoids_table_refiltertest_task_to_record_batches_filter_with_positional_deletes_handles_empty_batchValidated locally:
python -m pytest tests/io/test_pyarrow.py -q -k "task_to_record_batches_nanos or filter_without_positional_deletes_avoids_table_refilter or filter_with_positional_deletes_handles_empty_batch"make lint