CONNECT doesn't work with SET @var

MariaDB [tmp]> SET @foo = (SELECT MIN(col1) FROM long_column_test);

ERROR 1148 (42000): CONNECT Unsupported command

MariaDB [tmp]> SELECT MIN(col1) INTO @foo FROM long_column_test;

Query OK, 1 row affected (1.30 sec)

MariaDB [tmp]> SELECT @foo;

+------+

| @foo |

+------+

| a    |

+------+

1 row in set (0.00 sec)