Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/15677
https://github.com/apache/spark/pull/15690 is to resolve the behaviors of a
few string-to-string expressions, including `reverse`. After rethinking about
it, I think we should not support implicit casting for these expressions. Thus,
we need to fix the source codes.
Before documenting the argument types, we really need to check the
behaviors. If anything is inappropriate, we should correct it. Please remember
to deliver the document changes with the corresponding test cases.
Generally, discipline is needed for document changes, if we really want to
attract more enterprise customers to use Spark in their production systems.
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