etseidl commented on PR #6257:
URL: https://github.com/apache/arrow-rs/pull/6257#issuecomment-2299396590

   > @etseidl I wonder if you have any thoughts on this code / the writing of 
null counts
   
   Sorry, I was away when this discussion started (interesting things always 
happen when I'm on vacation 😉). I think this PR is heading the right direction. 
 Writing `Some(0)` when the null count is known is the right behavior IMO. On 
the read side I've always treated missing null counts as unknown rather than 0, 
so the changes here are welcome. I think it's fine for the read side to 
continue with the old behavior for some time.


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