From: Martin Hansson
Date: August 12 2010 4:08pm
Subject: Re: bzr commit into mysql-5.1-bugteam branch (Georgi.Kodinov:3479)
 Bug#55580
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Hi,
patch approved, just one minor comment.

Georgi Kodinov skrev 2010-08-12 13.46:
> ...
> +SELECT * FROM t1 GROUP BY POLYGON((SELECT a FROM t2 LIMIT 1 FOR UPDATE), t1.a);
>    
I would use a different function that POLYGON here. Otherwise people 
will get surprised that such a limited-application function is needed. 
You can provoke that crash using

SELECT * FROM t1 GROUP BY
(SELECT a FROM t2 LIMIT 1 FOR UPDATE) + t1.a;

otherwise, great patch.

Best Regards

Martin