diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/TypeUtils.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/TypeUtils.scala
index f603cbfb0cc2..c5ab5ffe2b98 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/TypeUtils.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/TypeUtils.scala
@@ -42,13 +42,14 @@ object TypeUtils {
   }
 
   def checkForSameTypeInputExpr(types: Seq[DataType], caller: String): TypeCheckResult = {
-    if (types.distinct.size > 1) {
-      TypeCheckResult.TypeCheckFailure(
-        s"input to $caller should all be the same type, but it's " +
-          types.map(_.simpleString).mkString("[", ", ", "]"))
-    } else {
-      TypeCheckResult.TypeCheckSuccess
-    }
+    types.foreach ( t =>
+      if (!t.sameType(types.head)) {
+        return TypeCheckResult.TypeCheckFailure(
+          s"input to $caller should all be the same type, but it's " +
+            types.map(_.simpleString).mkString("[", ", ", "]"))
+      }
+    )
+    TypeCheckResult.TypeCheckSuccess
   }
 
   def getNumeric(t: DataType): Numeric[Any] =