MDEV-9077 add sys_schema from https://github.com/mysql/mysql-sys

scripts/sys_schema/functions/ps_thread_account.sql

@@ -0,0 +1,71 @@
+-- Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+--
+-- This program is free software; you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation; version 2 of the License.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with this program; if not, write to the Free Software
+-- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+DROP FUNCTION IF EXISTS ps_thread_account;
+
+DELIMITER $$
+
+CREATE DEFINER='root'@'localhost' FUNCTION ps_thread_account (
+        in_thread_id BIGINT UNSIGNED
+    ) RETURNS TEXT
+    COMMENT '
+             Description
+             -----------
+
+             Return the user@host account for the given Performance Schema thread id.
+
+             Parameters
+             -----------
+
+             in_thread_id (BIGINT UNSIGNED):
+               The id of the thread to return the account for.
+
+             Example
+             -----------
+
+             mysql> select thread_id, processlist_user, processlist_host from performance_schema.threads where type = ''foreground'';
+              +-----------+------------------+------------------+
+              | thread_id | processlist_user | processlist_host |
+              +-----------+------------------+------------------+
+              |        23 | NULL             | NULL             |
+              |        30 | root             | localhost        |
+              |        31 | msandbox         | localhost        |
+              |        32 | msandbox         | localhost        |
+              +-----------+------------------+------------------+
+              4 rows in set (0.00 sec)
+
+              mysql> select sys.ps_thread_account(31);
+              +---------------------------+
+              | sys.ps_thread_account(31) |
+              +---------------------------+
+              | msandbox@localhost        |
+              +---------------------------+
+              1 row in set (0.00 sec)
+            '
+
+    SQL SECURITY INVOKER
+    NOT DETERMINISTIC
+    READS SQL DATA
+BEGIN
+    RETURN (SELECT IF(
+                      type = 'FOREGROUND',
+                      CONCAT(processlist_user, '@', processlist_host),
+                      type
+                     ) AS account
+              FROM `performance_schema`.`threads`
+             WHERE thread_id = in_thread_id);
+END$$
+
+DELIMITER ;