AngersZhuuuu commented on issue #26431: [SPARK-29769][SQL] Support "exists/not 
exists" condition as all type Join's on cpndition
URL: https://github.com/apache/spark/pull/26431#issuecomment-551354687
 
 
   > do you mean the optimizer rule `PushPredicateThroughJoin` is the culprit 
that forbids "exists/not exists" condition in outer joins?
   
   You can see my change in `PushPredicateThroughJoin` I add a new split method 
to make it fit for join type. it will build left/right EvaluateCondition in 
different case. Such as LeftOuterJoin, we should build rightEvaluateCondition  
first. Since it will build a new Right child. 

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