avantgardnerio commented on PR #23167:
URL: https://github.com/apache/datafusion/pull/23167#issuecomment-4794048512

   > using the existing ExecutionPlan::partition_statistics
   
   Yes, that's the case above. The static statistics lie, because they can't 
know the carnality reduction. The aggregate does before it emits a batch, thus 
the flip from the static plan in the dynamic one.


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