diff --git a/sql/core/src/test/scala/org/apache/spark/sql/QueryTest.scala b/sql/core/src/test/scala/org/apache/spark/sql/QueryTest.scala
index cff9d22d08..484e438033 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/QueryTest.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/QueryTest.scala
@@ -249,9 +249,10 @@ abstract class QueryTest extends PlanTest {
         }
         p
     }.transformAllExpressions {
-      case a: ImperativeAggregate => return
+      case _: ImperativeAggregate => return
       case _: TypedAggregateExpression => return
       case Literal(_, _: ObjectType) => return
+      case _: UserDefinedGenerator => return
     }
 
     // bypass hive tests before we fix all corner cases in hive module.