[Pkg-postgresql-public] Bug#596278: postgresql-8.4: Please support subselects in "using" clause of "alter column" changing type

[Christoph Berg]

Testcase:

create table links (targeturi text, uri text);
create table pages (pageid integer, uri text);
alter table links alter column targeturi type integer using (select pageid from pages where uri = targeturi);

Christoph
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