Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11555#issuecomment-194607599
Yeah, this is a fundamental issue. I am afraid we are unable to add any
extra subqueries for SQL generation. I will check whether SQL generation in
traditional RDBMS is also using subqueries. Will post the answer I got in this
PR.
BTW, I am fine to merge this at first.
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