Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/22029
@cloud-fan sorry, I mistyped. I meant `(a, b) IN (select (x, y) ...)` is a
valid subquery, but probably my understanding that it was a multivalued
subquery is wrong, as I realize now that `(x, y)` returns Presto's equivalent
of a struct. So I have to update the PR description that Presto behaves as
Hive, ie. it doesn't support multivalue subqueries. Sorry for the confusion, I
am updating the PR description.
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