diff --git a/src/sql/engine/expr/ob_expr_operator.cpp b/src/sql/engine/expr/ob_expr_operator.cpp
index e462671663..b43f76dc4f 100644
--- a/src/sql/engine/expr/ob_expr_operator.cpp
+++ b/src/sql/engine/expr/ob_expr_operator.cpp
@@ -1985,9 +1985,8 @@ int ObExprOperator::calc_cmp_type2(ObExprResType &type,
     ret = OB_ERR_INVALID_CMP_OP;
     LOG_WARN("incorrect cmp type with json arguments", K(type1), K(type2), K(type_), K(ret));
   } else if (is_oracle_mode()
-             && (ob_is_user_defined_type(type1.get_type())
-                 || ob_is_user_defined_type(type2.get_type()))
-             && ((type_ >= T_OP_EQ && type_ <= T_OP_NE) || type_ == T_FUN_SYS_NULLIF)) {
+             && (ob_is_user_defined_type(type1.get_type()) || ob_is_user_defined_type(type2.get_type()))) {
+    // udt tyes not implemented in ORACLE_RELATIONAL_CMP_TYPE curretly
     if ((ob_is_user_defined_type(type1.get_type()) && ob_is_user_defined_type(type2.get_type()))
         || (type1.is_null() || type2.is_null())) {
       ret = OB_ERR_NO_ORDER_MAP_SQL; // oracle error code compability
diff --git a/src/sql/engine/expr/ob_expr_oracle_nullif.cpp b/src/sql/engine/expr/ob_expr_oracle_nullif.cpp
index d4340da4f9..a9c3120122 100644
--- a/src/sql/engine/expr/ob_expr_oracle_nullif.cpp
+++ b/src/sql/engine/expr/ob_expr_oracle_nullif.cpp
@@ -134,7 +134,9 @@ bool ObExprOracleNullif::is_same_type(const ObExprResType &type1,
   if (oracleType1 == oracleType2 ||
       is_numberic_type(oracleType1, oracleType2) ||
       is_string_type(oracleType1, oracleType2) ||
-      is_time_type(oracleType1, oracleType2)) {
+      is_time_type(oracleType1, oracleType2) ||
+      ((oracleType1 == ObOExtendType || oracleType1 == ObOUDTSqlType)
+       && (oracleType2 == ObOExtendType || oracleType2 == ObOUDTSqlType))) {
     ret = true;
   }
 
diff --git a/src/sql/resolver/dml/ob_del_upd_resolver.cpp b/src/sql/resolver/dml/ob_del_upd_resolver.cpp
index 805a57ad5c..3003269a76 100644
--- a/src/sql/resolver/dml/ob_del_upd_resolver.cpp
+++ b/src/sql/resolver/dml/ob_del_upd_resolver.cpp
@@ -1462,9 +1462,15 @@ int ObDelUpdResolver::resolve_returning(const ParseNode *parse_tree)
             }
           }
         }
-        if (OB_SUCC(ret) && ob_is_user_defined_type(expr->get_data_type())) {
+        if (OB_SUCC(ret)
+            && (ob_is_user_defined_sql_type(expr->get_data_type())
+                || ob_is_xml_pl_type(expr->get_data_type(), expr->get_udt_id()))) {
+          // ORA-22816 returning clause is currently not object type columns
+          // but this is success in ORA: execute immediate 'insert into t1 values(4,5) returning udt1(c1, c2) into :a' using out a;
+          // xmltype is not allowed: execute immediate 'insert into t2 values(:b) returning xmltype(c1) into :a' using b, out a;
           ret = OB_ERR_RETURNING_CLAUSE;
-          LOG_WARN("RETURNING clause is currently not supported for object type", K(ret));
+          LOG_WARN("RETURNING clause is currently not supported for object type",
+                   K(ret), K(expr->get_data_type()));
         }
 
         if (OB_SUCC(ret)) {
diff --git a/src/sql/resolver/dml/ob_dml_resolver.cpp b/src/sql/resolver/dml/ob_dml_resolver.cpp
index 86b8658992..03bafc02a1 100755
--- a/src/sql/resolver/dml/ob_dml_resolver.cpp
+++ b/src/sql/resolver/dml/ob_dml_resolver.cpp
@@ -1356,6 +1356,9 @@ int ObDMLResolver::implict_cast_pl_udt_to_sql_udt(ObRawExpr* &real_ref_expr)
   if (OB_ISNULL(real_ref_expr)) {
     ret = OB_ERR_UNEXPECTED;
     LOG_WARN("real_ref_expr is null", K(ret));
+  } else if (real_ref_expr->get_result_type().get_type() >= ObMaxType
+             && OB_FAIL(real_ref_expr->formalize(session_info_))) {
+    LOG_WARN("failed to do formalize", K(ret), K(real_ref_expr));
   } else if (real_ref_expr->get_result_type().is_ext()) {
     if (real_ref_expr->get_result_type().get_udt_id() == T_OBJ_XML) {
       // add implicit cast to sql xmltype
@@ -1453,13 +1456,13 @@ int ObDMLResolver::check_column_udt_type(ParseNode *root_node)
         }
       }
       if (pos_col < 0) { // not found
-        ret = OB_INVALID_ARGUMENT;
-        LOG_WARN("get invalid table name", K(ret), K(tab_str), K(tab_has_alias));
+        ret = OB_ERR_BAD_FIELD_ERROR;
+        LOG_WARN("get invalid identifier name", K(ret), K(tab_str), K(col_str), K(tab_has_alias));
       } else {
         ObColumnRefRawExpr* col_expr = the_col_item.get_expr();
         if (OB_ISNULL(col_expr)) {
-          ret = OB_INVALID_ARGUMENT;
-          LOG_WARN("get invalid table name", K(ret), K(tab_str), K(tab_has_alias));
+          ret = OB_ERR_BAD_FIELD_ERROR;
+          LOG_WARN("get invalid identifier name", K(ret), K(tab_str), K(col_str), K(tab_has_alias));
         } else if (!col_expr->get_result_type().is_user_defined_sql_type()) {
           ret = OB_ERR_NOT_OBJ_REF;
         }