notashes commented on issue #20324:
URL: https://github.com/apache/datafusion/issues/20324#issuecomment-3893785525

   @adriangb dynamic filters when enabled start off with lit(true) for the 
first record batch. I guess in that short time when all rows are qualified and 
we have target_partitions > 1 other files are done reading. and we only start 
getting selective starting next batch. and may end up having many overheads of 
row filter evaluation (that's just my hypothesis) 


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