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

scripts/sys_schema/functions/extract_table_from_file_name.sql

@@ -0,0 +1,62 @@
+-- Copyright (c) 2014, 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 extract_table_from_file_name;
+
+DELIMITER $$
+
+CREATE DEFINER='root'@'localhost' FUNCTION extract_table_from_file_name (
+        path VARCHAR(512)
+    )
+    RETURNS VARCHAR(64) 
+    COMMENT '
+             Description
+             -----------
+
+             Takes a raw file path, and extracts the table name from it.
+
+             Useful for when interacting with Performance Schema data 
+             concerning IO statistics, for example.
+
+             Parameters
+             -----------
+
+             path (VARCHAR(512)):
+               The full file path to a data file to extract the table name from.
+
+             Returns
+             -----------
+
+             VARCHAR(64)
+
+             Example
+             -----------
+
+             mysql> SELECT sys.extract_table_from_file_name(\'/var/lib/mysql/employees/employee.ibd\');
+             +---------------------------------------------------------------------------+
+             | sys.extract_table_from_file_name(\'/var/lib/mysql/employees/employee.ibd\') |
+             +---------------------------------------------------------------------------+
+             | employee                                                                  |
+             +---------------------------------------------------------------------------+
+             1 row in set (0.02 sec)
+            '
+    SQL SECURITY INVOKER
+    DETERMINISTIC
+    NO SQL
+BEGIN
+    RETURN LEFT(SUBSTRING_INDEX(REPLACE(SUBSTRING_INDEX(REPLACE(path, '\\', '/'), '/', -1), '@0024', '$'), '.', 1), 64);
+END$$
+
+DELIMITER ;