Github user davies commented on the pull request:
https://github.com/apache/spark/pull/12720#issuecomment-215264517
@hvanhovell I still does not understand why we should move the rewrite into
analyzer. InSubquery/Exists are just normal predicate expression, once we can
get the references of them right, they could be pushed down correctly. We
already make sure that all the reference from outer table should not in the
output of it's child, it's easy to find out all the references to outer table
in Exists/InSubquery. Could you try this?
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