view is created, but can't be used

CREATE VIEW vv AS SELECT 1 AS i1 FROM dual GROUP BY i1;

select * from vv;

MariaDB [test]> SELECT 1 AS i1 FROM dual GROUP BY i1;

+----+

| i1 |

+----+

|  1 |

+----+

1 row in set (0.00 sec)

MariaDB [test]> CREATE VIEW vv AS SELECT 1 AS i1 FROM dual GROUP BY i1;

Query OK, 0 rows affected (0.06 sec)

MariaDB [test]> show tables;

+----------------+

| Tables_in_test |

+----------------+

| vv             |

+----------------+

1 row in set (0.00 sec)

MariaDB [test]> select * from vv;

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'group by ''' at line 1

view_body_utf8=select 1 AS `i1` group by \'\'

mariadb-version=100131