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
index 4535176a14..45ec2045de 100644
--- 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
@@ -268,7 +268,7 @@ class Analyzer(
      *  We need to get all of its subsets for the rule described above, the subset is
      *  represented as sequence of expressions.
      */
-    def rollupExprs(exprs: Seq[Expression]): Seq[Seq[Expression]] = exprs.inits.toSeq
+    def rollupExprs(exprs: Seq[Expression]): Seq[Seq[Expression]] = exprs.inits.toIndexedSeq
 
     /*
      *  GROUP BY a, b, c WITH CUBE