Github user nsyca commented on the issue:
https://github.com/apache/spark/pull/16044
@hvanhovell I can add a new test case but I want to reiterate that this is
not an exposed case because `ExistenceJoin` does not exist in the course of the
`PushPredicateThroughJoin` rule. The `ExistenceJoin` is rewritten at the
`RewritePredicateSubquery` rule, which is currently placed at the very last
batch of the Optimizer phase, after the batch that have
`PushPredicateThroughJoin` rule.
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