tibrewalpratik17 opened a new pull request, #12544:
URL: https://github.com/apache/pinot/pull/12544

   label:
   `bugfix` 
   
   Potential fix for #12397 
   
   As called out in the issue:
   ```
   With Partial Upserts, say we had 4 events for a given primary-key in the 
Mutable Segment: R0, R1, R2, R3. Let's also assume that the comparison column 
value of these events is: R0 < R1 < (R2 = R3).
   
   If after applying the sorted column, their order changes to: R0, R1, R3, R2, 
then the UMM will start pointing to R2 as the valid doc.
   ```
   
   Now based on the assumption that R3's docId will be greater than R2's docId, 
raising this fix as an echancement to fix in #12395 where in case of same 
comparison column value we also check the docID value to know for a particular 
segment which one to keep.
   
   cc @ankitsultana @Jackie-Jiang 
   


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