Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/7478#issuecomment-122712702
Just finished my code reading. Seems the only place left to be updated is
`missingInput`
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/QueryPlan.scala#L54-L55
in `QueryPlan`. We need to filter out all virtual columns. Right now, we only
filter out `grouping__id`.
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