Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17191#discussion_r113679144
--- 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 --
ok I have an idea: first, check there is `UnresolvedAttribute` in grouping
expression, then check these `UnresolvedAttribute`s can't be resolved by
child.output.
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