Jefffrey commented on PR #10994:
URL: https://github.com/apache/arrow-rs/pull/10994#issuecomment-5548430052

   from a codex review it identified 2 edge cases:
   
   - for structs with non-nullable ree/union, currently we reject these because 
we try to take on them, even though we can mask them with the structs own null 
buffer (overly strict)
   - if we have nested unions where inner union has no nullable children, but 
as a field in the outer union it is marked as nullable, we can incorrect select 
it to be the null child (e.g. for dense unions)
   
   (these are pretty extreme edge cases honestly, i wouldnt mind them being a 
separate issue; just wanted to point out for completeness)


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