select a.name ... union select a.name ... order by a.name fails in 7.1

Hi!

I'm not certain this is correct SQL, and I know the rewrite is
easy, but here is a difference I found between 7.0.3 and 7.1:

select a.name from users a
union
select a.name from oldusers a
order by a.userid;

ERROR:  Relation 'a' does not exist

This works fine in postgres 7.0.x

the simple rewrite is of course 'order by userid', but it is
tedious to find all places in our system where this happens. It
seems some programmers have used the above syntax a lot :(

Is it a bug, or was it a feature in 7.0?

/Palle
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