akupchinskiy commented on PR #2167:
URL: 
https://github.com/apache/datafusion-comet/pull/2167#issuecomment-3208043464

   > Thanks @akupchinskiy I checked it failed now on main
   > 
   > ```
   > org.apache.comet.CometRuntimeException: Partition number mismatch: 3 != 4
   > ```
   > 
   > Any reason the first partition number is taken? Can it be an issue if this 
value would be too small/large comparing to others?
   
   I believe it just picks the first from plan traversal output which might 
even be undetermined at least in cases when AQE is on. In simple scenarios, 
there is only one non-broadcast plan in the list - so usually it is no issue. 
The more explicit way to reproduce it is to run  TPCDS query set on comet build 
for spark 4.0: ~15 queries fail with the same error,  and all of them run with 
no error on the patched version. I have not figured out the root cause of this 
regression though


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