Test UUID with this function

[nicola-strappazzon]

This other version to make UUID() provided by Percona.

DELIMITER //
CREATE DEFINER=`root`@`localhost` FUNCTION `ordered_uuid`(uuid BINARY(36)) 
RETURNS binary(16) DETERMINISTIC 
RETURN UNHEX(CONCAT(SUBSTR(uuid, 15, 4),SUBSTR(uuid, 10, 4),SUBSTR(uuid, 1, 8),SUBSTR(uuid, 20, 4),SUBSTR(uuid, 25)));
//
DELIMITER ;