Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/11904#discussion_r57112678
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -414,6 +399,22 @@ class Analyzer(
}
/**
+ * Build a project list for Project/Aggregate and expand the star if
possible
+ */
+ private def buildExpandedProjectList(
+ exprs: Seq[NamedExpression],
+ plan: UnaryNode): Seq[NamedExpression] = {
+ exprs.flatMap {
+ // Using Dataframe/Dataset API: testData2.groupBy($"a",
$"b").agg($"*")
+ case s: Star => s.expand(plan.child, resolver)
+ // Using SQL API without running ResolveAlias: SELECT * FROM
testData2 group by a, b
+ case UnresolvedAlias(s: Star, _) => expandStarExpression(s,
plan.child) :: Nil
--- End diff --
I think it should be `s.expand(plan.child, resolver)`, what you do here is
just get rid of the outer `UnresolvedAlias` and resolve the star in next round.
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