Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/13522
Some more ideas: I think we should create a subclass of `UnixTime` to
handle the `left.dataType == StringType && right.foldable` case. In optimizer,
we can replace it with null literal if the `formatter` is null, then we don't
need to do null check for every record, like this PR did.
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