Github user dbtsai commented on the issue:
https://github.com/apache/spark/pull/21442
@maropu I didn't do a full performance benchmark. I believe the performance
gain can be from predicate pushdown when only one element in the set. This can
be a lot.
I forgot which one, I remember in impala or drill, they allow multiple
predicates to be pushed down, and I believe this can be a win in many cases.
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