Github user srowen commented on the issue:
https://github.com/apache/spark/pull/15925
Yes you're exactly right, what I meant was that if "IN (empty set)" is
never generated in SQL, then there's no problem with how it's generated. I
suppose it would still also be correct to make sure the the SQL generation code
does generate "IN ('')" or whatever is correct for some/all dialects just in
case this ever comes up again.
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