CONNECT: misleading warning

MariaDB [test]> CREATE TABLE t (a INT) ENGINE=CONNECT TABLE_TYPE=csv;

Query OK, 0 rows affected, 1 warning (0.18 sec)

Warning (Code 1105): No file name. Table will use t.csv

MariaDB [test]> INSERT INTO t VALUES (1);

Query OK, 1 row affected (0.00 sec)

MariaDB [test]> ALTER TABLE t TABLE_TYPE=fmt;

ERROR 1296 (HY000): Got error 174 'Writing FMT files is not implemented yet' from CONNECT

Warning (Code 1105): Congratulation, you just created a read-only void table!

Error (Code 1296): Got error 174 'Writing FMT files is not implemented yet' from CONNECT

MariaDB [test]> SHOW CREATE TABLE t;

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

| Table | Create Table                                                                                           |

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

| t     | CREATE TABLE `t` (

  `a` int(11) DEFAULT NULL

) ENGINE=CONNECT DEFAULT CHARSET=latin1 `TABLE_TYPE`=csv |

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

1 row in set (0.00 sec)