Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22029
> yes, there is a clear definition for the expected behavior in the other
RDBMS.
Can you put the general definition of the IN behavior (without subquery) in
the PR description? The PR titile only specified the behavior for a specific
case, not a general definition. e.g. nested fields are not mentioned.
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