Github user davies commented on the pull request:
https://github.com/apache/spark/pull/12306#issuecomment-208577343
@hvanhovell Thanks for taking over these!
In the first prototype, I did the rewriting in analyzer, later I realize
that it may make more sense to do that in Optimizer, this make us easily to
dump the original query as SQL (required by views). Resolve correlated subquery
could be easily (resolve the un-resolvable attributes in subquery from children
of current plan).
How do you think?
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