SET STATEMENT keycache1.key_buffer_size=1024 FOR SELECT 1;

mysqld: sql/sql_parse.cc:2693: int mysql_execute_command(THD*): Assertion `0' failed.

#6  0x00007f11828cc6f1 in *__GI___assert_fail (assertion=0x7f1185af5f48 "0", file=<optimized out>, line=2693, function=0x7f1185af8e20 "int mysql_execute_command(THD*)") at assert.c:81

#7  0x00007f11851e0ab8 in mysql_execute_command (thd=0x7f1169350070) at /sql/sql_parse.cc:2693

#8  0x00007f11851edffb in mysql_parse (thd=0x7f1169350070, rawbuf=0x7f1169080088 "SET statement keycache1.key_buffer_size=1024 for select 1", length=57, parser_state=0x7f1184ca0210) at /sql/sql_parse.cc:7046

#9  0x00007f11851dd898 in dispatch_command (command=COM_QUERY, thd=0x7f1169350070, packet=0x7f116905f071 "SET statement keycache1.key_buffer_size=1024 for select 1", packet_length=57) at /sql/sql_parse.cc:1466

#10 0x00007f11851dc6b6 in do_command (thd=0x7f1169350070) at /sql/sql_parse.cc:1095

#11 0x00007f118530ab77 in do_handle_one_connection (thd_arg=0x7f1169350070) at /sql/sql_connect.cc:1351

#12 0x00007f118530a8bc in handle_one_connection (arg=0x7f1169350070) at /sql/sql_connect.cc:1262

#13 0x00007f11848e6b50 in start_thread (arg=<optimized out>) at pthread_create.c:304

#14 0x00007f118297d20d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112

#15 0x0000000000000000 in ?? ()

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)

MySQL [test]> SET statement keycache1.key_buffer_size=1024 for select 1;

ERROR 1229 (HY000): Variable 'key_buffer_size' is a GLOBAL variable and should be set with SET GLOBAL