MDEV-11825: Make session variables TRACKING enabled by default

mysql-test/r/mysqld--help.result

@@ -937,11 +937,7 @@ The following options may be given as the first argument:
  --session-track-state-change 
  Track changes to the session state.
  --session-track-system-variables=name 
- Track changes in registered system variables. For
- compatibility with MySQL defaults this variable should be
- set to "autocommit, character_set_client,
- character_set_connection, character_set_results,
- time_zone"
+ Track changes in registered system variables. 
  --session-track-transaction-info=name 
  Track changes to the transaction attributes. OFF to
  disable; STATE to track just transaction state (Is there
@@ -1457,7 +1453,7 @@ secure-file-priv (No default value)
 server-id 1
 session-track-schema TRUE
 session-track-state-change FALSE
-session-track-system-variables 
+session-track-system-variables autocommit,character_set_client,character_set_connection,character_set_results,time_zone
 session-track-transaction-info OFF
 show-slave-auth-info FALSE
 silent-startup FALSE

mysql-test/suite/sys_vars/r/session_track_system_variables_basic.result

@@ -5,25 +5,25 @@
 # Global - default
 SELECT @@global.session_track_system_variables;
 @@global.session_track_system_variables
-
+autocommit,character_set_client,character_set_connection,character_set_results,time_zone
 # Session - default
 SELECT @@session.session_track_system_variables;
 @@session.session_track_system_variables
-
+autocommit,character_set_client,character_set_connection,character_set_results,time_zone
 
 # via INFORMATION_SCHEMA.GLOBAL_VARIABLES
 SELECT * FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME LIKE 'session_track%' ORDER BY VARIABLE_NAME;
 VARIABLE_NAME	VARIABLE_VALUE
 SESSION_TRACK_SCHEMA	ON
 SESSION_TRACK_STATE_CHANGE	OFF
-SESSION_TRACK_SYSTEM_VARIABLES	
+SESSION_TRACK_SYSTEM_VARIABLES	autocommit,character_set_client,character_set_connection,character_set_results,time_zone
 SESSION_TRACK_TRANSACTION_INFO	OFF
 # via INFORMATION_SCHEMA.SESSION_VARIABLES
 SELECT * FROM INFORMATION_SCHEMA.SESSION_VARIABLES WHERE VARIABLE_NAME LIKE 'session_track%' ORDER BY VARIABLE_NAME;
 VARIABLE_NAME	VARIABLE_VALUE
 SESSION_TRACK_SCHEMA	ON
 SESSION_TRACK_STATE_CHANGE	OFF
-SESSION_TRACK_SYSTEM_VARIABLES	
+SESSION_TRACK_SYSTEM_VARIABLES	autocommit,character_set_client,character_set_connection,character_set_results,time_zone
 SESSION_TRACK_TRANSACTION_INFO	OFF
 SET @global_saved_tmp =  @@global.session_track_system_variables;
 
@@ -34,7 +34,7 @@ SELECT @@global.session_track_system_variables;
 autocommit
 SELECT @@session.session_track_system_variables;
 @@session.session_track_system_variables
-
+autocommit,character_set_client,character_set_connection,character_set_results,time_zone
 
 # Altering session variable's value
 SET @@session.session_track_system_variables='autocommit';
@@ -72,25 +72,25 @@ SET @@session.session_track_system_variables = DEFAULT;
 
 SELECT @@global.session_track_system_variables;
 @@global.session_track_system_variables
-
+autocommit,character_set_client,character_set_connection,character_set_results,time_zone
 SELECT @@session.session_track_system_variables;
 @@session.session_track_system_variables
-
+autocommit,character_set_client,character_set_connection,character_set_results,time_zone
 
 # Variables' values in a new session (con2).
 connect  con2,"127.0.0.1",root,,test,$MASTER_MYPORT,;
 SELECT @@global.session_track_system_variables;
 @@global.session_track_system_variables
-
+autocommit,character_set_client,character_set_connection,character_set_results,time_zone
 SELECT @@session.session_track_system_variables;
 @@session.session_track_system_variables
-
+autocommit,character_set_client,character_set_connection,character_set_results,time_zone
 
 # Altering session should not affect global.
 SET @@session.session_track_system_variables = 'sql_mode';
 SELECT @@global.session_track_system_variables;
 @@global.session_track_system_variables
-
+autocommit,character_set_client,character_set_connection,character_set_results,time_zone
 SELECT @@session.session_track_system_variables;
 @@session.session_track_system_variables
 sql_mode
@@ -104,7 +104,7 @@ SELECT @@global.session_track_system_variables;
 sql_mode
 SELECT @@session.session_track_system_variables;
 @@session.session_track_system_variables
-
+autocommit,character_set_client,character_set_connection,character_set_results,time_zone
 
 # Switching to the default connection.
 connection default;

mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result

@@ -3930,13 +3930,13 @@ ENUM_VALUE_LIST	OFF,ON
 READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	OPTIONAL
 VARIABLE_NAME	SESSION_TRACK_SYSTEM_VARIABLES
-SESSION_VALUE	
-GLOBAL_VALUE	
+SESSION_VALUE	autocommit,character_set_client,character_set_connection,character_set_results,time_zone
+GLOBAL_VALUE	autocommit,character_set_client,character_set_connection,character_set_results,time_zone
 GLOBAL_VALUE_ORIGIN	COMPILE-TIME
-DEFAULT_VALUE	
+DEFAULT_VALUE	autocommit,character_set_client,character_set_connection,character_set_results,time_zone
 VARIABLE_SCOPE	SESSION
 VARIABLE_TYPE	VARCHAR
-VARIABLE_COMMENT	Track changes in registered system variables. For compatibility with MySQL defaults this variable should be set to "autocommit, character_set_client, character_set_connection, character_set_results, time_zone"
+VARIABLE_COMMENT	Track changes in registered system variables. 
 NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL

sql/sys_vars.cc

@@ -5472,12 +5472,10 @@ static Sys_var_ulonglong Sys_max_thread_mem(
 
 static Sys_var_sesvartrack Sys_track_session_sys_vars(
        "session_track_system_variables",
-       "Track changes in registered system variables. "
-       "For compatibility with MySQL defaults this variable should be set to "
-       "\"autocommit, character_set_client, character_set_connection, "
-       "character_set_results, time_zone\"",
+       "Track changes in registered system variables. ",
        CMD_LINE(REQUIRED_ARG), IN_SYSTEM_CHARSET,
-       DEFAULT(""),
+       DEFAULT("autocommit,character_set_client,character_set_connection,"
+       "character_set_results,time_zone"),
        NO_MUTEX_GUARD);
 
 static bool update_session_track_schema(sys_var *self, THD *thd,