mingmwang commented on PR #5430:
URL: 
https://github.com/apache/arrow-datafusion/pull/5430#issuecomment-1449516970

   @ygf11 @jackwener 
   I'm not sure whether we should make the rule `ReplaceDistinctWithAggregate` 
to handle the where-in/exists subquery specifically. My original thinking was 
let the rules `DecorrelateWhereExists` and `DecorrelateWhereIn`  rewrite the 
subqueries to Joins and in the second pass the rule 
`ReplaceDistinctWithAggregate`  will rewrite the `Distinct` to `Aggregate` 
since we already run those rules multiple times 


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