wangyum commented on pull request #33702:
URL: https://github.com/apache/spark/pull/33702#issuecomment-898991124


   @wankunde Is the result of the following query correct if the join keys has 
duplicate values:
   ```sql
   select t1.a, count(*) from t1 left join t2 on t1.a = t2.a group by t1.a;
   ```


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