Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11283#issuecomment-192662222
Yeah, definitely, it helps a lot. Otherwise, toSQL needs to identify the
pattern and convert it back using a few assumptions. The pattern and
assumptions we made depends on the implementation of our analyzer rules.
Before we finalize the design, I will first stop working on the SQL
generation of `multi-distinct aggregation`. Thanks! @liancheng
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