> ------------------------------------------------------------
> revno: 3517
> revision-id: sergey.glukhov@oracle.com-20101213103926-okypkn10adeeyns8
> parent: davi.arnaut@oracle.com-20101207150620-s49dstok48oy585o
> committer: Sergey Glukhov <sergey.glukhov@oracle.com>
> branch nick: mysql-5.1-bugteam
> timestamp: Mon 2010-12-13 13:39:26 +0300
> message:
>   Bug#58396 group_concat and explain extended are still crashy
>   Explain fails at fix_fields stage and some items are left unfixed,
>   particulary Item_group_concat. Item_group_concat::orig_args field
>   is uninitialized in this case and Item_group_concat::print call 
>   leads to crash.
>   The fix:
>   move the initialization of Item_group_concat::orig_args
>   into constructor.