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