Github user viirya commented on the issue:
https://github.com/apache/spark/pull/18968
I'm not very sure how we use `ListQuery.dataType`, or do we actually use it
since it might not be very meaningful to have a datatype for a IN subquery.
In order to make sure type matching, we do type checking in `In` between
the output of subquery wrapped in `ListQuery` and the `value` expressions. We
won't use `ListQuery` with other expression, I think.
Maybe it has `dataType` just because it needs to have one, as it inherits
`Expression`?
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