Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/21403
no, sorry, you're right. In the case when it is not a subquery, it is safe
to treat them as the same. I got confused checking the result of other DBs as
they are all behaving differently in that scenario. I will try and follow your
suggestion about creating a new `InSubquery` expression then, in orer to handle
that case where all DBs behave consistently and it is more clear which the
behavior should be. Sorry for the mistake. Thanks.
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