alamb commented on issue #20325:
URL: https://github.com/apache/datafusion/issues/20325#issuecomment-3897963432

   > I think a third one is that parallelism is different. FilterExec often 
sits on top of a RepartitionExec. Unless there are more files than cores (even 
if there are, some may be smaller/larger, etc.) or infra-file re-partitioning 
is turned on the parallelism is going to be lower with predicate pushdown than 
in a FilterExec.
   
   This could be -- however, my tests I have set the parallelism to 1 via 
`target_partitions` so I think there are other things going on as well. 


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