Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/17191#discussion_r113645978 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala --- @@ -998,6 +998,22 @@ class Analyzer( } /** + * Replace unresolved expressions in grouping keys with resolved ones in SELECT clauses. + */ + object ResolveAggAliasInGroupBy extends Rule[LogicalPlan] { + + override def apply(plan: LogicalPlan): LogicalPlan = plan.resolveOperators { + case agg @ Aggregate(groups, aggs, child) + if conf.groupByAliases && child.resolved && aggs.forall(_.resolved) && --- End diff -- I think the `UnresolvedAttribute` in grouping expressions that can be resolved by child's output, should be already resolved by `ResolveReferences`.
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