etseidl commented on PR #7307:
URL: https://github.com/apache/arrow-rs/pull/7307#issuecomment-3443712138

   I agree that before putting too much effort into this PR we agree on the 
correct way to implement row numbers (I defer to @alamb and others for the 
arrow side of this).
   
   One concern I have with the approach here is how to provide exact row 
numbers if we start selectively reading row group metadata. If we don't have 
metadata for all preceding row groups, we can't know the starting row number. 
This at least argues for reverting back to using an `Option` for the start 
index.


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