llama90 opened a new pull request, #41827:
URL: https://github.com/apache/arrow/pull/41827
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### Rationale for this change
Support `cast` kernel from (`dense` or `sparse`) union to (large) string
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### What changes are included in this PR?
- Support `cast` kernel
- from `dense union` to (large) `string`
- from `sparse union` to (large) `string`
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### Are these changes tested?
Yes. It is passed by existing test cases.
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### Are there any user-facing changes?
No.
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