From: | "John Hansen" <john(at)geeknet(dot)com(dot)au> |
---|---|
To: | <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Recursive types? |
Date: | 2005-04-11 10:54:46 |
Message-ID: | 5066E5A966339E42AA04BA10BA706AE5628F@rodrick.geeknet.com.au |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
Consider the following:
create table foo ( id serial primary key, path text);
alter table foo add ref foo;
Table "public.foo"
Column | Type | Modifiers
--------+---------+-----------------------------------------------------
id | integer | not null default nextval('public.foo_id_seq'::text)
path | text |
ref | foo |
Indexes:
"foo_pkey" PRIMARY KEY, btree (id)
insert into foo (path) VALUES ('/');
insert into foo (path,ref) VALUES ('/foo',ROW(1,'/',NULL));
insert into foo (path,ref) VALUES
('/foo/bar',ROW(2,'/foo',ROW(1,'/',NULL)));
select * from foo;
id | path | ref
----+----------+-------------------
1 | / |
2 | /foo | (1,/,)
3 | /foo/bar | (2,/foo,"(1,/,)")
(3 rows)
However, it is not possible to create such a type using create type, as
there is no alter type, even tho alter table does the same thing.
Is this a bug or a random feature?
It is also not possible to dump and restore this using pg_dump.
... John
From | Date | Subject | |
---|---|---|---|
Next Message | Reinhard Max | 2005-04-11 12:46:09 | probably needless linking against readline and ncurses |
Previous Message | Tom Lane | 2005-04-11 06:49:06 | Re: Question regarding clock-sweep |