diff --git a/src/pl/ob_pl_resolver.cpp b/src/pl/ob_pl_resolver.cpp
index cdeba63538..55a80632de 100644
--- a/src/pl/ob_pl_resolver.cpp
+++ b/src/pl/ob_pl_resolver.cpp
@@ -10049,10 +10049,6 @@ int ObPLResolver::resolve_qualified_name(ObQualifiedName &q_name,
         }
       }
     }
-  } else if (q_name.is_pl_var()) {
-    if (OB_FAIL(resolve_var(q_name, unit_ast, expr))) {
-      LOG_WARN("failed to resolve var", K(q_name), K(ret));
-    }
   } else {
     if (OB_FAIL(resolve_var(q_name, unit_ast, expr))) {
       if (OB_ERR_SP_UNDECLARED_VAR == ret) {
@@ -11717,19 +11713,13 @@ int ObPLMockSelfArg::mock()
     if (expr_params_.at(0)->has_flag(IS_UDT_UDF_SELF_PARAM)) {
       // already has self argument, do nothing ...
     } else if (ObObjAccessIdx::IS_UDT_NS == access_idxs_.at(access_idxs_.count() - 1).access_type_
-        && expr_params_.at(0)->get_result_type().get_udt_id()
+        && expr_params_.at(0)->get_result_type().get_expr_udt_id()
               == access_idxs_.at(access_idxs_.count() - 1).var_index_) {
       expr_params_.at(0)->add_flag(IS_UDT_UDF_SELF_PARAM);
       mocked_ = true;
       mark_only_ = true;
-    } else if (expr_params_.at(0)->get_result_type().is_xml_sql_type()
-               && (T_OBJ_XML == access_idxs_.at(access_idxs_.count() - 1).var_index_)) {
-      //select xmltype.getclobval(xmlparse()) from dual;
-      expr_params_.at(0)->add_flag(IS_UDT_UDF_SELF_PARAM);
-      mocked_ = true;
-      mark_only_ = true;
     } else if (access_idxs_.at(access_idxs_.count() - 1).elem_type_.is_composite_type()
-               && expr_params_.at(0)->get_result_type().get_udt_id()
+               && expr_params_.at(0)->get_result_type().get_expr_udt_id()
                     == access_idxs_.at(access_idxs_.count() - 1).elem_type_.get_user_type_id()) {
       ObConstRawExpr *null_expr = NULL;
       OZ (expr_factory_.create_raw_expr(T_NULL, null_expr));
diff --git a/src/sql/engine/expr/ob_expr_res_type.h b/src/sql/engine/expr/ob_expr_res_type.h
index cd9567ab35..8a0b05e870 100644
--- a/src/sql/engine/expr/ob_expr_res_type.h
+++ b/src/sql/engine/expr/ob_expr_res_type.h
@@ -165,6 +165,20 @@ public:
   {
     return accuracy_.get_length_semantics();
   }
+  OB_INLINE uint64_t get_expr_udt_id() const
+  {
+    uint64_t udt_id = OB_INVALID_ID;
+    if (is_user_defined_sql_type()) {
+      if (is_xml_sql_type()) {
+        udt_id = T_OBJ_XML;
+      } else {
+        // NOTICE: process new sql type id in here.
+      }
+    } else {
+      udt_id = get_udt_id();
+    }
+    return udt_id;
+  }
   OB_INLINE uint64_t get_udt_id() const
   {
     return accuracy_.get_accuracy();