Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/9385#issuecomment-154594596
Thanks for your contribution, but I'm tempted to not make this change
unless there is actually a bug. We are eliminating the subqueries because they
will impact optimization and planning. However, keeping the qualifiers around
could actually be useful if we want to give better error messages.
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