> ------------------------------------------------------------
> revno: 2763
> revision-id: sergey.glukhov@sun.com-20090602063813-33mh88cz5vpa2jqe
> parent: alexey.kopytov@sun.com-20090601124224-zgt3yov9wou590e9
> committer: Sergey Glukhov <Sergey.Glukhov@sun.com>
> branch nick: mysql-5.0-bugteam
> timestamp: Tue 2009-06-02 11:38:13 +0500
> message:
>   Bug#45152 crash with round() function on longtext column in a derived table
>   The crash happens due to wrong max_length value which is set on
>   Item_func_round::fix_length_and_dec() stage. The value is set to
>   args[0]->max_length which is too big in case of LONGTEXT(LONGBLOB) fields.
>   The fix is to set max_length using float_length() function.