create user foo@localhost;

set @track_schema= @@session_track_schema, @track_vars= @@session_track_system_variables;

set global session_track_schema=ON, session_track_system_variables='*';

--connect(con1,localhost,root,,)

set lock_wait_timeout=22;

select @@lock_wait_timeout, database();

--echo # Running change_user

--enable_session_track_info

--change_user foo

--disable_session_track_info

select @@lock_wait_timeout, database();

--disconnect con1

--connection default

drop user foo@localhost;

set global session_track_schema= @track_schema, session_track_system_variables= @track_vars;

@@lock_wait_timeout	database()

22	test

# Running change_user

select @@lock_wait_timeout, database();

@@lock_wait_timeout	database()

86400	NULL