Github user liancheng commented on the issue:
https://github.com/apache/spark/pull/16184
LGTM, thanks for working on this!
I think the problem is that we generate a foldable predicate (`lit(null)`)
during optimization phase but fail to fold it. Ideally, the optimizer should
fold `IsNotNull($"_1") && lit(null)` into a `lit(false)`. But it's still good
to check for foldable predicates at planning phase.
Merging this to master and branch-2.1.
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