Why can't I still not use an ALIAS in the SELECT portion of an SQL statement?

[Daevid Vincent]

When will I be able to do something seemingly so basic as this re-use of an
alias?

SELECT DATE_ADD('2007-10-23', INTERVAL user_access_hours HOUR) 
                AS group_duration_date,
         UNIX_TIMESTAMP(group_duration_date)
                AS group_duration_date_timestamp
FROM     end_user_groups;

Error Code : 1054
Unknown column 'group_duration_date' in 'field list'
(0 ms taken)

So instead I must do this very cumbersome and inefficient way:

SELECT DATE_ADD('2007-10-23', INTERVAL user_access_hours HOUR) 
                AS group_duration_date,
         UNIX_TIMESTAMP(DATE_ADD('2007-10-23', 
                                        INTERVAL user_access_hours HOUR)) 
                AS group_duration_date_timestamp
FROM     end_user_groups;

*sigh*

This has been a cause of frustration since mysql 3.x series. 
Are there any plans to fix this annoyance? If so, in what version?

Currently using: 
mysql  Ver 14.12 Distrib 5.0.41, for pc-linux-gnu (i686)


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