SELECT sys.ps_thread_account(NULL);
sys.ps_thread_account(NULL)
NULL
SELECT sys.ps_thread_account(234623462376);
sys.ps_thread_account(234623462376)
NULL
SELECT sys.ps_thread_account(-1);
ERROR 22003: Out of range value for column 'in_thread_id' at row 1
SELECT sys.ps_thread_account(sys.ps_thread_id(NULL));
sys.ps_thread_account(sys.ps_thread_id(NULL))
root@localhost
