MySQL 8.3 Release Notes
给定性能模式线程 ID，返回与线程关联的 用户名@主机名
-
in_thread_id BIGINT UNSIGNED：要返回帐户的线程 ID。该值应与某个性能模式threads表行的THREAD_ID列匹配。
mysql> SELECT sys.ps_thread_account(sys.ps_thread_id(CONNECTION_ID()));
+----------------------------------------------------------+
| sys.ps_thread_account(sys.ps_thread_id(CONNECTION_ID())) |
+----------------------------------------------------------+
| root@localhost |
+----------------------------------------------------------+