emecii commented on PR #11052:
URL: https://github.com/apache/arrow-rs/pull/11052#issuecomment-5690699961

   For #11052, I can add a benchmark-only PR covering list-index validity: 
in-bounds/missing indexes, explicit nulls, nested lists, List/ListView, sliced 
inputs, typed/Variant outputs, and a struct-only control. I'd compare identical 
fixtures on base/head and measure allocations separately from runtime.
   
   An initial local allocation probe shows additional bitmap-union costs on 
nullable paths, so shared-buffer cloning alone doesn't establish the cost. Does 
this cover the evidence you'd like before merging the fix?
   


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