Github user nsyca commented on the issue:
https://github.com/apache/spark/pull/15763
I'd like to a note that a piece of existing code that closes to address
this problem but only done for the scalar subquery context can be found by
searching this pattern in CheckAnalysis.scala (line 126):
_"The correlated scalar subquery can only contain equality predicates:"_
An existing test coverage for that scenario is at
_SubquerySuite/non-equal correlated scalar subquery_
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