yongster commented on PR #10994:
URL: https://github.com/apache/arrow-rs/pull/10994#issuecomment-5571632262

   @Jefffrey I relaxed the sparse path as you suggested: mixed-nullability 
sparse unions now succeed when at least one child is nullable.
   
   Agreed on the two Codex edge cases (struct-masked non-nullable REE/Union, 
nested union chosen as the null child). I'll leave those as a follow-up rather 
than expanding this PR.


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