AngersZhuuuu edited a comment on issue #26437: [SPARK-29800][SQL] Plan Exists 
's subquery in PlanSubqueries
URL: https://github.com/apache/spark/pull/26437#issuecomment-552178025
 
 
   @cloud-fan @dilipbiswal @maropu 
   For support correlated subquery in join's on condition like 
https://github.com/apache/spark/pull/25854#discussion_r335293923
   
   We need to update  `PushPredicateThroughJoin ` and `RewritePredicateSubquery 
` together. 
   Since in `PushPredicateThroughJoin` it will transform a subquery condition 
rewrite as a  Filter's condition. This change will be catch by 
`RewritePredicateSubquery`, and after `RewritePredicateSubquery`'s transform, 
the total logical is broken. 
   I prefer to fix all this after this pr and 
https://github.com/apache/spark/pull/26431 finished

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