Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/17660
In general, we can't decide whether a UDF is null-propagate or not, so we
can't catch NPE for `Expression.eval` blindly. When we call `Expression.eval`
in optimizer, we should make sure we do not pass unexpected input like
`EliminateOuterJoin` did.
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