Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/17660
I think the root problem is, in `EliminateOuterJoin.buildNewJoinType`, we
always build `leftHasNonNullPredicate` and `rightHasNonNullPredicate`. If it's
left join, only `rightHasNonNullPredicate` is used, and when building
`leftHasNonNullPredicate`, we may pass null values to a UDF that is not
supposed to run on null values.
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