Why do you think this is an issue with SQLyog? it is the MySQL server that executesthequery and returns the result set. Please try n another client (‘mysql’ command line, phpMyAdmin or whatever you have acces to) and check here.
I think it would bemore appropriate tor eport this to bugs.mysql.com, if you think it is a bug in the server: And you should always mention the server version in such reports BTW.
You are of course welcome to ask users of our Forums (and us). But we would need a full test case with table structure and data to verify. And in principle we support or own programs and not the MySQl server.