Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17948#discussion_r116150714
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -1003,18 +1003,30 @@ class Analyzer(
*/
object ResolveAggAliasInGroupBy extends Rule[LogicalPlan] {
+ // This is a strict check though, we put this to apply the rule only
in alias expressions
--- End diff --
`... only if the expression is not resolvable by child`
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