Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/2084#issuecomment-53378339
Instead of doing this by modifying the predicate logic, I think that we
should just add a rule in `HiveTypeCoercion` that finds `BinaryPredicates`
where one side is a string and the other side is a timestamp and adds a `Cast`.
Perhaps in `PromoteStrings`?
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