Re: ALTER TABLE .. < ADD | DROP > OIDS

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Rod Taylor <rbt(at)rbt(dot)ca>
Cc: Pgsql Performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: ALTER TABLE .. < ADD | DROP > OIDS
Date: 2002-12-06 05:00:14
Message-ID: 200212060500.gB650El12702@candle.pha.pa.us
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OK, patch applied and tested.

---------------------------------------------------------------------------

Rod Taylor wrote:
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> I wish to create an alter command which will allow a table to have OIDs
> added or removed.
>
>
> The tricky part appears to be changing the tuples themselves. I believe
> if I pull the same trick that cluster does (create new file, copy
> tuples, etc) it can be done fairly easily.
>
> First, set up pg_class appropriately (oid flag).
>
> Second, copy out tuples from oldfile to newfile, running a
> heap_deformtuple() -> heap_formtuple() process on each. Since
> heap_deformtuple only deals with positive numbered attributes
> (non-system attributes) this should be safe to do on a mis-configured
> relation. heap_formtuple completes the dirty work of setting up the OID
> column appropriately.
>
> --
> Rod Taylor <rbt(at)rbt(dot)ca>
>
> PGP Key: http://www.rbt.ca/rbtpub.asc
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