Github user juliuszsompolski commented on the issue:
https://github.com/apache/spark/pull/21403
I think that the way the columns are defined in the subquery should define
the semantics.
E.g.:
`(a, b) IN (select c, d from ...)` - unpack (a, b) and treat it as a multi
column comparison as in current semantics.
`(a, b) IN (select (c, d) from ..)` - keep it packed and treat it as a
single column IN.
`(a, b, c) IN (select (d, e), f from ..)` or similar combinations - catch
it in analysis as ambiguous
`(a, b, c) IN (select (d, e), f, g from ..)` - but this is valid as long as
`a` matches the type of `(d, e)`
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