Dandandan commented on issue #20324:
URL: https://github.com/apache/datafusion/issues/20324#issuecomment-3919835751

   > A heuristic based approach is, I think, doomed to have pathological cases. 
This is why I’m focusing on a version that is much more akin to a cost based 
mini optimizer with a statistical basis.
   
   I think we can just avoid the cases that are *known* to bring never benefit 
(e.g. don't use a rowfilter beyond page filtering if it can not avoid IO).


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