Github user rick-ibm commented on the pull request:
https://github.com/apache/spark/pull/8983#issuecomment-146280859
I don't find any guidance in the Standard for what should be done if the
left side of the IN operator is an untyped NULL literal. Technically, there is
no such thing in the Standard. The NULL needs to be cast to a legal type.
Section 8.4 provides no guidance about the type correspondence of the IN
list values. However, section 8.9 implies that the IN list is equivalent to the
result of a subquery, which means that we must be able to cast all of the
values on the right side to a common type.
Thanks,
-Rick
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