diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala
index a099fadcec365..06ca139870804 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala
@@ -294,7 +294,7 @@ case class AttributeReference(
   }
 
   override lazy val preCanonicalized: Expression = {
-    AttributeReference("none", dataType.asNullable)(exprId)
+    AttributeReference("none", dataType)(exprId)
   }
 
   override def newInstance(): AttributeReference =