cloud-fan 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-551352079
 
 
   do you mean the optimizer rule `PushPredicateThroughJoin` is the culprit 
that forbids "exists/not exists" condition in outer joins?

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