Fix error message

src/sql/resolver/cmd/ob_variable_set_resolver.cpp

@@ -173,7 +173,7 @@ int ObVariableSetResolver::resolve_set_variable(
         if (0 == var_node.variable_name_.case_compare("ob_compatibility_mode") &&
             0 == strncasecmp(value_node.str_value_, "oracle", std::min(static_cast<int32_t>(value_node.str_len_), 6))) {
           ret = OB_NOT_SUPPORTED;
-          LOG_USER_ERROR(OB_NOT_SUPPORTED, "Not support oracle mode");
+          LOG_USER_ERROR(OB_NOT_SUPPORTED, "Oracle mode");
         } else if (OB_FAIL(ObResolverUtils::resolve_const_expr(params_, value_node, var_node.value_expr_, NULL))) {
           LOG_WARN("resolve variable value failed", K(ret));
         }