gene-bordegaray commented on PR #24501:
URL: https://github.com/apache/datafusion/pull/24501#issuecomment-5480311489

   
   > **`project` applies the monotonic fallback to non-final range keys, where 
the disjointness check does not hold**
   > 
   > Partition membership for a multi-key `Range` is a lexicographic comparison 
of the whole tuple, but the disjointness check only proves something about one 
key. That gap is reachable.
   
   read through this and yes, can confirm that this is possible and correctness 
bug. We could get duplicate group rows or partial sums as final results. I also 
 agree with @jayzhan211 suggested approach for a solution
   
   thank you @jayzhan211 🙇 


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