diff --git a/src/sql/resolver/dml/ob_dml_stmt.cpp b/src/sql/resolver/dml/ob_dml_stmt.cpp
index 282caa8cfe8fe6ebe2630fddf3af53cc6b2b48ca..3cff16e67226f0e9da341e5fbbb4a533b9af5a0f 100644
--- a/src/sql/resolver/dml/ob_dml_stmt.cpp
+++ b/src/sql/resolver/dml/ob_dml_stmt.cpp
@@ -635,6 +635,9 @@ int ObDMLStmt::deep_copy_stmt_struct(
   } else if (OB_FAIL(ObRawExprUtils::copy_expr(
                  expr_factory, other.limit_percent_expr_, limit_percent_expr_, COPY_REF_DEFAULT))) {
     LOG_WARN("deep copy limit percent expr failed", K(ret));
+  } else if (OB_FAIL(
+                 ObRawExprUtils::copy_exprs(expr_factory, other.user_var_exprs_, user_var_exprs_, COPY_REF_DEFAULT))) {
+    LOG_WARN("deep copy user var exprs failed", K(ret));
   } else if (OB_FAIL(from_items_.assign(other.from_items_))) {
     LOG_WARN("assign from items failed", K(ret));
   } else if (OB_FAIL(stmt_hint_.assign(other.stmt_hint_))) {
diff --git a/src/sql/resolver/expr/ob_raw_expr_util.cpp b/src/sql/resolver/expr/ob_raw_expr_util.cpp
index 785d478ed57ee736d6e41159c53531ec3ae46e89..dc89d63dde905302edec2527ab582d5577fe0a17 100644
--- a/src/sql/resolver/expr/ob_raw_expr_util.cpp
+++ b/src/sql/resolver/expr/ob_raw_expr_util.cpp
@@ -2151,14 +2151,26 @@ int ObRawExprUtils::copy_expr(ObRawExprFactory& expr_factory, const ObRawExpr* o
         break;
       }
       case ObRawExpr::EXPR_CONST: {
-        ObConstRawExpr* dest_const = NULL;
-        const ObConstRawExpr* origin_const = static_cast<const ObConstRawExpr*>(origin);
-        if (OB_FAIL(expr_factory.create_raw_expr(origin->get_expr_type(), dest_const)) || OB_ISNULL(dest_const)) {
-          LOG_WARN("failed to allocate raw expr", K(dest_const), K(ret));
-        } else if (OB_FAIL(dest_const->deep_copy(expr_factory, *origin_const, COPY_REF_DEFAULT, use_new_allocator))) {
-          LOG_WARN("failed to deep copy const expr", K(ret));
+        if (T_USER_VARIABLE_IDENTIFIER == origin->get_expr_type()) {
+          ObUserVarIdentRawExpr* dest_expr = NULL;
+          const ObUserVarIdentRawExpr* origin_expr = static_cast<const ObUserVarIdentRawExpr*>(origin);
+          if (OB_FAIL(expr_factory.create_raw_expr(origin->get_expr_type(), dest_expr)) || OB_ISNULL(dest_expr)) {
+            LOG_WARN("failed to allocate raw expr", K(dest_expr), K(ret));
+          } else if (OB_FAIL(dest_expr->deep_copy(expr_factory, *origin_expr, COPY_REF_DEFAULT, use_new_allocator))) {
+            LOG_WARN("failed to deep copy const expr", K(ret));
+          } else {
+            dest = dest_expr;
+          }
         } else {
-          dest = dest_const;
+          ObConstRawExpr *dest_const = NULL;
+          const ObConstRawExpr *origin_const = static_cast<const ObConstRawExpr *>(origin);
+          if (OB_FAIL(expr_factory.create_raw_expr(origin->get_expr_type(), dest_const)) || OB_ISNULL(dest_const)) {
+            LOG_WARN("failed to allocate raw expr", K(dest_const), K(ret));
+          } else if (OB_FAIL(dest_const->deep_copy(expr_factory, *origin_const, COPY_REF_DEFAULT, use_new_allocator))) {
+            LOG_WARN("failed to deep copy const expr", K(ret));
+          } else {
+            dest = dest_const;
+          }
         }
         break;
       }