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apache · Jan 12, 2015 · d42b707 · d42b707
1 parent 8b3a274
commit d42b707
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
@@ -209,9 +209,9 @@ class Analyzer(catalog: Catalog,
 
           aggregateExprs.find { e =>
             !isValidAggregateExpression(e.transform {
-              // Should trim aliases. These aliases can only be introduced while resolving unnamed
-              // expressions like `GetField` and UDF calls, because GROUP BY clause doesn't allow
-              // aliasing.
+              // Should trim aliases. These aliases can be introduced while resolving unnamed
+              // expressions like `GetField` and UDF calls, and when a user explicitly assigns
+              // an alias to a grouping expression in the SELECT clause.
               case a: Alias => a.child
             })
           }.foreach { e =>