mariadb/mysql-test/t/change_user.test

#
# Bug#20023 mysql_change_user() resets the value of SQL_BIG_SELECTS
#

--echo Bug#20023
SELECT @@session.sql_big_selects;
SELECT @@global.max_join_size;
--echo change_user
--change_user
SELECT @@session.sql_big_selects;
SELECT @@global.max_join_size;
SET @@global.max_join_size = 10000;
SET @@session.max_join_size = default;
--echo change_user
--change_user
SELECT @@session.sql_big_selects;
SET @@global.max_join_size = -1;
SET @@session.max_join_size = default;
--echo change_user
--change_user
SELECT @@session.sql_big_selects;

#
# Bug#31418 User locks misfunctioning after mysql_change_user()
#

--echo Bug#31418
SELECT IS_FREE_LOCK('bug31418');
SELECT IS_USED_LOCK('bug31418');
SELECT GET_LOCK('bug31418', 1);
SELECT IS_USED_LOCK('bug31418') = CONNECTION_ID();
--echo change_user
--change_user
SELECT IS_FREE_LOCK('bug31418');
SELECT IS_USED_LOCK('bug31418');

#
# Bug#31222: com_% global status counters behave randomly with
# mysql_change_user.
#

FLUSH STATUS;

--disable_result_log
--disable_query_log

let $i = 100;

while ($i)
{
  dec $i;

  SELECT 1;
}

--enable_query_log
--enable_result_log

SHOW GLOBAL STATUS LIKE 'com_select';

--change_user

SHOW GLOBAL STATUS LIKE 'com_select';