Github user holdenk commented on a diff in the pull request:
https://github.com/apache/spark/pull/9419#discussion_r43681600
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -240,10 +240,52 @@ class Analyzer(
x.child
}
+ // We will insert another Projection if the GROUP BY keys are
contained in the
--- End diff --
Maybe in addition to describing what we do we should explain why we are
inserting this projection here as well?
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