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[57_maintenance] fix(arrow-array): use the field's type id in dense union logical_nulls - #11810
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apache#11643) # Which issue does this PR close? - Closes apache#11595. # Rationale for this change A dense union with a single field whose type id is not 0 reported no logical nulls, so `logical_null_count`, `is_null` and `is_not_null` were wrong for it. # What changes are included in this PR? The single-field path of `UnionArray::logical_nulls` passed the child nulls to `gather_nulls` under type id 0. It now passes the field's own type id, enumerating `self.fields` the same way `fields_logical_nulls` does. # Are these changes tested? Yes, `test_dense_union_one_field_nonzero_type_id_logical_nulls`. It fails without the fix. # Are there any significant user-facing changes? No. AI use: I used Claude Code to find the cause and write the fix and test. I reviewed the change and checked that the test fails without the fix.
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October 22, 2026 12:24
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57.3.2(October 2026) #11666Cherry-pick of 24c53c7