[Variant] add variant_to_arrow union builder#10313
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Casting Variant to dense or sparse Union dispatches each value to the union field that most exactly represents its runtime type (lossless widening allowed, declaration order breaks ties). Null rows land in a Null-typed child if declared, otherwise the first child, since unions have no top-level null buffer. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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variant_to_arrow union buildervariant_to_arrow union builder
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Which issue does this PR close?
The last type to be supported by
variant_to_arrowcast.Rationale for this change
Check issue
What changes are included in this PR?
variant_to_arrowunion cast support + unit testsAre these changes tested?
Are there any user-facing changes?