findepi commented on PR #6608:
URL: https://github.com/apache/arrow-rs/pull/6608#issuecomment-2427639487

   Thank you @alamb @westonpace @tustvold for your time reviewing this!
   
   > I feel fairly strongly that we should not merge this, people will likely 
use this blindly without appreciating the severe performance penalty it entails.
   
   @tustvold  Can you elaborate there the severe performance penalty comes from 
and what would it take to fix it?
   
   For DataFusion at least the alternative is to all `logical_nulls().map(|n| 
n.null_count())` which is strictly less performant than the alternative offered 
here. DataFusion will continue to use this slower path until a faster path 
exists
   
   
   


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