SET STATEMENT executed after SET GLOBAL does not work

MariaDB [test]> # SET STATEMENT works (OK)

MariaDB [test]> set statement lock_wait_timeout=1 for select @@lock_wait_timeout;

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

| @@lock_wait_timeout |

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

|                   1 |

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

1 row in set (0.01 sec)

MariaDB [test]> # Setting a totally unrelated global variable

MariaDB [test]> set global general_log=0;

Query OK, 0 rows affected (0.00 sec)

MariaDB [test]> # SET STATEMENT does not work anymore (FAIL)

MariaDB [test]> set statement lock_wait_timeout=1 for select @@lock_wait_timeout;

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

| @@lock_wait_timeout |

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

|            31536000 |

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

1 row in set (0.00 sec)

--echo # SET STATEMENT works (OK)

set statement lock_wait_timeout=1 for select @@lock_wait_timeout;

--echo # Setting a totally unrelated global variable

set global general_log=0;

--echo # SET STATEMENT does not work anymore (FAIL)

set statement lock_wait_timeout=1 for select @@lock_wait_timeout;

commit 3a3f88e789a41b309cfe902f4823c9c7ebbce6ca

Author: Oleksandr Byelkin <sanja@mariadb.com>

Date:   Fri Oct 24 10:13:08 2014 +0200

    MDEV-5231: Per query variables from Percona Server (rewritten)

elenst@wheezy-64:~/git/bb-10.1-set-statement$