Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/20163 @cloud-fan, actually I have the similar question too - https://github.com/apache/spark/pull/20163#discussion_r160017637. I tend to agree with it and I think we disallow this and document this. Just want to check if you feel strongly about this. If we need to support this, I believe the ways are 2. or 3. in https://github.com/apache/spark/pull/20163#issuecomment-355717642.
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