Spider wrapper name is case sensitive

MariaDB [(none)]> CREATE SERVER srv FOREIGN DATA WRAPPER MYSQL OPTIONS (SOCKET '/tmp/build.sock',DATABASE 'test',user 'buildbot',PASSWORD '');

Query OK, 0 rows affected (0.001 sec)

MariaDB [(none)]> SELECT spider_direct_sql ('SELECT 1','','SRV "srv"');

ERROR 12521 (HY000): Can't use wrapper 'MYSQL' for SQL connection

MariaDB [(none)]> CREATE SERVER srv FOREIGN DATA WRAPPER mysql OPTIONS (SOCKET '/tmp/build.sock',DATABASE 'test',user 'buildbot',PASSWORD '');

Query OK, 0 rows affected (0.001 sec)

MariaDB [(none)]> SELECT spider_bg_direct_sql ('SET SESSION _offset=2','','SRV "srv"');

ERROR 12720 (HY000): Host: and Socket:/tmp/build.sock aim self server. Please change spider_same_server_link parameter if this link is required.

MariaDB [(none)]> set spider_same_server_link=1;

Query OK, 0 rows affected (0.000 sec)

MariaDB [(none)]> SELECT spider_bg_direct_sql ('SET @offset=2','','SRV "srv"');

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

| spider_bg_direct_sql ('SET @offset=2','','SRV "srv"') |

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

|                                                     1 |

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

1 row in set (0.001 sec)