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

scripts/sys_schema/templates/function.sql

@@ -0,0 +1,56 @@
+-- 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 <function name>;
+
+DELIMITER $$
+
+CREATE DEFINER='root'@'localhost' FUNCTION <function name> (
+        /* Variables */
+    )
+    RETURNS <data type>
+    COMMENT '
+             Description
+             -----------
+
+             ...
+
+             Parameters
+             -----------
+
+             ...
+
+             Returns
+             -----------
+
+             <data type>
+
+             Example
+             -----------
+
+             ...
+
+            '
+    SQL SECURITY INVOKER
+    { DETERMINISTIC | NOT DETERMINISTIC }
+    { CONTAINS SQL | NO SQL | READS SQL DATA | MODIFIES SQL DATA }
+BEGIN
+  
+    /* BODY */
+    RETURN <something>;
+
+END$$
+
+DELIMITER ;