Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/5247#issuecomment-101842061
This implementation is still making changes to the query plan in
`DataFrame` that aren't reflected in the `queryExecution`. This is something I
want to avoid. Also, it seems to me that this issue is pretty much already
fixed as most things inherit from RunnableCommand, which should never run a
Spark job. So I'd rather not add hacks in the wrong places that are doing
things like double conversion into catalyst format (which I think the current
implementation does).
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