Github user viirya commented on the issue:
https://github.com/apache/spark/pull/18968
We can write IN subquery like:
SELECT * FROM t1
WHERE struct(t1.a, t1.b) IN (SELECT t2.d, t2.e
FROM t2
WHERE t1.c < t2.f)")
It is valid because the length of value expressions (t1.a, t1.b) matches
the length of subquery output (t2.d, t2.e).
So seems `ListQuery.plan` can produce more than one column?
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