> ------------------------------------------------------------
> revno: 3148.9.6
> revision-id: martin.hansson@sun.com-20091102122407-krzh4h0i052lbwr5
> parent: davi.arnaut@sun.com-20091102112236-k3myix2xy8miyv4s
> committer: Martin Hansson <martin.hansson@sun.com>
> branch nick: 5.1bt
> timestamp: Mon 2009-11-02 13:24:07 +0100
> message:
>   Bug#47925: regression of range optimizer and date comparison in 5.1.39!
>   
>   When a query was using a DATE or DATETIME value formatted
>   using any other separator characters beside hyphen '-', a
>   query with a greater-or-equal '>=' condition matching only
>   the greatest value in an indexed column, the result was
>   empty if index range scan was employed.
>   
>   The range optimizer got a new feature between 5.1.38 and
>   5.1.39 that changes a greater-or-equal condition to a
>   greater-than if the value matching that in the query was not
>   present in the table. But the value comparison function
>   compared the dates as strings instead of dates.
>   
>   The bug was fixed by splitting the function
>   get_date_from_str in two: One part that parses and does
>   error checking. This function is now visible outside the
>   module. The old get_date_from_str now calls the new
>   function.