yongster commented on PR #10991:
URL: https://github.com/apache/arrow-rs/pull/10991#issuecomment-5549710269

   @Jefffrey on the relationship with #10994:
   
   This PR's `nullif` path for RunEndEncoded and Union delegates to `take` with 
null indices. That only produces correct logical nulls if `take` itself:
   
   - prefers a nullable Union child for a null index
   - errors when a REE `values` field is non-nullable
   - errors when a Sparse Union has non-nullable fields
   
   Those `take` fixes live in #10994. The small `take.rs` diff here is a subset 
of that PR, included so this branch still works against current `main`.
   
   I'd like to wait for #10994 to land, then rebase this PR so it only contains 
the `nullif.rs` changes.


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