[core][python] Preserve historical field options during time travel - #9697
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JingsongLi merged 1 commit intoSep 11, 2026
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This fixes a real historical-read failure: the selected snapshot's fields must be paired with its VECTOR/BLOB declarations. I checked Java and Python copy/time-travel paths, cumulative explicit overrides/removals, and the descriptor aliases. Restoring only the declaration options while keeping runtime/scan options is appropriately scoped; Python's intentional legacy-alias behavior is preserved.
No blocking issue found. All 9 Java TimeTravelSchemaEvolutionTest cases pass with head classes on JDK 8, and all 9 Python time-travel schema-evolution cases pass. The tests cover retained snapshots/tags and readable historical payloads, not just option-map equality.
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Purpose
close #9696
Tests