fix(arrow): return owned field index slices - #1159
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August 9, 2026 22:51
fallintoplace
marked this pull request as draft
August 9, 2026 22:54
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Rationale for this change
Schema.FieldIndices and StructType.FieldIndices return slices backed by internal index maps. Mutating a returned slice can corrupt later field lookups.
What changes are included in this PR?
Return cloned index slices from both methods. Schema.HasField reads the internal map directly so the ownership fix does not add an allocation there.
Are these changes tested?
Yes. Regression tests mutate returned slices and verify that Schema and StructType keep their original indices. The full arrow package suite passes.
Are there any user-facing changes?
Callers now receive slices they can safely modify.