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Fix Python UDAF list-of-timestamps return by enforcing list-valued scalars and caching PyArrow types#1347

Draft

kosiew wants to merge 7 commits intoapache:mainfrom

kosiew:typeconversion-issue-1339

Commits on Jan 20, 2026

Implement UDAF improvements for list type handling
kosiew
committed
Document UDAF list-valued scalar returns
kosiew
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Fix pyarrow calls and improve type handling in RustAccumulator
kosiew
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Refactor RustAccumulator to support pyarrow array types and improve type checking for list types
kosiew
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Fixed PyO3 type mismatch by cloning Array/ChunkedArray types before unbinding and binding fresh copies when checking array-likeness, eliminating the Bound reference error
kosiew
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Add timezone information to datetime objects in test_udaf_list_timestamp_return
kosiew
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clippy fix
kosiew
committed