> ------------------------------------------------------------
> revno: 2841.1.1
> revision-id: sergey.glukhov@sun.com-20090401084033-161k4f8qucafy6mj
> parent: ramil@mysql.com-20090401053459-07x8z2pw2ev94xck
> committer: Sergey Glukhov <Sergey.Glukhov@sun.com>
> branch nick: mysql-5.1-bugteam
> timestamp: Wed 2009-04-01 13:40:33 +0500
> message:
>   Bug#43183 ExctractValue() brings result list in missorder
>   The problem is that XML functions(items) do not reset null_value
>   before their execution and further item excution may use
>   null_value value of the previous result.
>   The fix is to reset null_value.