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Posted to github@arrow.apache.org by "mingmwang (via GitHub)" <gi...@apache.org> on 2023/03/01 08:01:51 UTC

[GitHub] [arrow-datafusion] mingmwang commented on pull request #5430: Replace distinct with aggregate for where-in/exists subquery

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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