Bug: aliasing in ORDER BY when UNIONing

What works:

# select o.id from op o order by o.id;
# select o.id from op o union all SELECT -1 order by id;

Does not work:

# select o.id from op o union all SELECT -1 order by o.id;
ERROR: Relation 'o' does not exist
# select o.id from op o union all SELECT -1 from op o order by o.id;
ERROR: Relation 'o' does not exist

Running today's CVS. (I finally converted my main workstation
to 7.1...)

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marko