andygrove commented on PR #1298:
URL: 
https://github.com/apache/datafusion-comet/pull/1298#issuecomment-2598563070

   After more debugging, I understand what is happening, but not sure what the 
correct fix is yet.
   
   We set `firstNonBroadcastPlanNumPartitions` to `0` because that is what 
`CometUnionExec.outputPartitioning` reports. However, when we execute the 
union, the resulting RDD actually has 10 partitions. We then call 
`setNumPartitions(0)` on the broadcast when we should be passing `10`.


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