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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