LP:1002162 - Temporary MERGE table with temporary underlying is broken by ALTER

MariaDB [test]> create temporary table t1_temp(i int);

Query OK, 0 rows affected (0.02 sec)

MariaDB [test]> create temporary table tm_temp_temp (i int) engine=merge union=(t1_temp) insert_method=last;

Query OK, 0 rows affected (0.00 sec)

MariaDB [test]> alter table tm_temp_temp insert_method=first;

ERROR 1168 (HY000): Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist

MariaDB [test]> check table tm_temp_temp;

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

| Table             | Op    | Msg_type | Msg_text                                                                                            |

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

| test.tm_temp_temp | check | Error    | Table 'test.t1_temp' is differently defined or of non-MyISAM type or doesn't exist                  |

| test.tm_temp_temp | check | Error    | Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist |

| test.tm_temp_temp | check | error    | Corrupt                                                                                             |

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

3 rows in set (0.00 sec)