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cleanup: string sys_var types

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Merge sys_var_charptr with sys_var_charptr_base, as well as merge
Sys_var_session_lexstring into Sys_var_lexstring. Also refactored
update methods of sys_var_charptr accordingly.

Because the class is more generic, session_update() calls
sys_var_charptr::session_update() which does not assume a buffer field
associated with THD, but instead call strdup/free, we get rid of
THD::default_master_connection_buff accordingly. This also makes THD
smaller by ~192 bytes, and there can be many thousands of concurrent
THDs.
This commit is contained in:
Yuchen Pei
2023-09-14 10:32:42 +10:00
parent d16817c477
commit 6151bde48c
7 changed files with 102 additions and 138 deletions
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5
sql/sql_class.cc
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@@ -1235,10 +1235,7 @@ void THD::init()
avoid temporary tables replication failure.
*/
variables.pseudo_thread_id= thread_id;
variables.default_master_connection.str= default_master_connection_buff;
::strmake(default_master_connection_buff,
global_system_variables.default_master_connection.str,
variables.default_master_connection.length);
mysql_mutex_unlock(&LOCK_global_system_variables);
user_time.val= start_time= start_time_sec_part= 0;