diff --git a/src/main/java/com/actiontech/dble/plan/common/item/ItemRef.java b/src/main/java/com/actiontech/dble/plan/common/item/ItemRef.java
index 1013c8b36..535fd9060 100644
--- a/src/main/java/com/actiontech/dble/plan/common/item/ItemRef.java
+++ b/src/main/java/com/actiontech/dble/plan/common/item/ItemRef.java
@@ -37,6 +37,7 @@ public class ItemRef extends Item {
         this.table = table;
         this.tableAlias = tableAlias;
         this.fieldAlias = fieldAlias;
+        this.charsetIndex = ref.charsetIndex;
     }
 
     @Override