1fanwang commented on PR #25742:
URL: https://github.com/apache/datafusion/pull/25742#issuecomment-5844014595

   @kita-renji thanks for re-running the whole differential against 84ef8f7. 
Your benchmark made the direction clear enough that I went ahead and 
implemented the grouped-count version as a stacked PR in #25767. That way this 
PR stays the verified correctness fix and the plan shape can be reviewed on its 
own. On the same 10M x 10M distinct data, INTERSECT ALL drops from about 2.3s 
here to about 0.12s there. The catch is that SQL INTERSECT ALL and EXCEPT ALL 
can no longer be produced as Substrait, since the producer has no Unnest 
support. The details are in that PR.
   


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