Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/14296#discussion_r72018679
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -1207,6 +1207,12 @@ class Analyzer(
val alias = Alias(ae, ae.toString)()
aggregateExpressions += alias
alias.toAttribute
+ case ne: NamedExpression => ne
--- End diff --
Removing it will cause error in `replaceGroupingFunc`. As we create a new
attribute based on the grouping column with additional alias, we can't find it
anymore in aggregate's group by expressions.
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