diff --git a/core/src/main/java/com/alibaba/druid/sql/ast/expr/SQLStructExpr.java b/core/src/main/java/com/alibaba/druid/sql/ast/expr/SQLStructExpr.java
index 55d83a8dee..68833cfa94 100644
--- a/core/src/main/java/com/alibaba/druid/sql/ast/expr/SQLStructExpr.java
+++ b/core/src/main/java/com/alibaba/druid/sql/ast/expr/SQLStructExpr.java
@@ -62,6 +62,7 @@ public SQLStructExpr clone() {
     }
 
     protected void cloneTo(SQLStructExpr x) {
+        x.dataType = this.dataType.clone();
         for (SQLAliasedExpr item : items) {
             x.addItem(item.clone());
         }