Session state tracking does not track variable changes via aliases

--enable_session_track_info

--echo #

--echo # Only max_delayed_threads is set for tracking,

--echo # the value changed via a synonym -- no tracking

--echo #

SET session_track_system_variables='max_delayed_threads';

SELECT @@max_delayed_threads;

SET max_insert_delayed_threads= 0;

--echo #

--echo # Both max_delayed_threads and the synonym are set for tracking,

--echo # the value changed via a synonym - only the synonym tracked

--echo #

SET session_track_system_variables='max_insert_delayed_threads,max_delayed_threads';

SELECT @@max_delayed_threads;

SET max_insert_delayed_threads= DEFAULT;

#

# Only max_delayed_threads is set for tracking,

# the value changed via a synonym -- no tracking

#

SET session_track_system_variables='max_delayed_threads';

SELECT @@max_delayed_threads;

@@max_delayed_threads

20

SET max_insert_delayed_threads= 0;

#

# Both max_delayed_threads and the synonym are set for tracking,

# the value changed via a synonym - only the synonym tracked

#

SET session_track_system_variables='max_insert_delayed_threads,max_delayed_threads';

SELECT @@max_delayed_threads;

@@max_delayed_threads

0

SET max_insert_delayed_threads= DEFAULT;

-- Tracker : SESSION_TRACK_SYSTEM_VARIABLES

-- max_insert_delayed_threads

-- 20