diff --git a/src/sql/engine/expr/ob_expr_operator.cpp b/src/sql/engine/expr/ob_expr_operator.cpp
index 4a2a3840ba..0ca180d9c5 100644
--- a/src/sql/engine/expr/ob_expr_operator.cpp
+++ b/src/sql/engine/expr/ob_expr_operator.cpp
@@ -1983,6 +1983,11 @@ int ObExprOperator::calc_cmp_type2(ObExprResType &type,
              && (type_ >= T_OP_EQ && type_ <= T_OP_NE)) {
     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()
+             && (type1.is_user_defined_sql_type() || type2.is_user_defined_sql_type())
+             && (type_ >= T_OP_EQ && type_ <= T_OP_NE)) {
+    ret = OB_ERR_INVALID_XML_DATATYPE;
+    LOG_WARN("incorrect cmp type with xml arguments", K(type1), K(type2), K(type_), K(ret));
   } else if (OB_FAIL(ObExprResultTypeUtil::get_relational_cmp_type(cmp_type,
                                                             type1.get_type(),
                                                             type2.get_type()))) {
diff --git a/src/sql/resolver/ddl/ob_ddl_resolver.cpp b/src/sql/resolver/ddl/ob_ddl_resolver.cpp
index 9f60fa554e..f310711b90 100644
--- a/src/sql/resolver/ddl/ob_ddl_resolver.cpp
+++ b/src/sql/resolver/ddl/ob_ddl_resolver.cpp
@@ -3236,7 +3236,7 @@ int ObDDLResolver::resolve_normal_column_attribute(ObColumnSchemaV2 &column,
         if (stmt::T_ALTER_TABLE == stmt_->get_stmt_type()) {
           // Adding a column-level check constraint is only supported in mysql mode
           if (is_oracle_mode()) {
-            ret = OB_ERR_UNEXPECTED;
+            ret = OB_ERR_COL_CHECK_CST_REFER_ANOTHER_COL;
             LOG_WARN("Adding a column-level check constraint is not supported in oracle mode", K(ret), K(stmt_->get_stmt_type()));
           } else if (OB_FAIL(resolve_check_constraint_node(*attr_node, alter_csts, &column))) {
             SQL_RESV_LOG(WARN, "resolve constraint failed", K(ret));
@@ -5340,6 +5340,9 @@ int ObDDLResolver::check_default_value(ObObj &default_value,
     }
 
     if (OB_FAIL(ret)) {
+    } else if (column.is_xmltype() && ob_is_numeric_type(tmp_default_value.get_type())) {
+      ret = OB_ERR_INVALID_XML_DATATYPE;
+      LOG_WARN("incorrect cmp type with xml arguments",K(tmp_default_value.get_type()), K(ret));
     } else if(OB_FAIL(ObObjCaster::to_type(data_type, cast_ctx, tmp_default_value, tmp_dest_obj, tmp_res_obj))) {
       LOG_WARN("cast obj failed, ", "src type", tmp_default_value.get_type(), "dest type", data_type, K(tmp_default_value), K(ret));
     } else if (OB_ISNULL(tmp_res_obj)) {