HippoBaro commented on issue #10023:
URL: https://github.com/apache/arrow-rs/issues/10023#issuecomment-4579690081

   Yes, for runs of valid, non-empty list rows, we can write the child values 
as one contiguous range, then use the parent list offsets to go back and mark 
the list starts in the repetition levels. That avoids calling into the child 
writer once per list row.
   
   I am working on an updated #9795 which contains this!


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