Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/21667
Reading it again closely, I am actually not super happy on the proposal
about introducing API change if the purpose of this is just to check the type
and throw an exception. Apparently, it looks so. I am less sure how useful it
is by looking the current change. It reduces the size of codes because it
blacklists. I would suggest to make the API change separate with this.
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