Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/11190#issuecomment-183614067
So I think the biggest question is whether we should do all of these
planning for subqueries and execution in prepare(), or come up with some other
way to run subqueries. While it works right now, I'm not a big fan of doing it
there because it mixes planning and execution and breaks the nice abstraction
we have.
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