| From: | Neil Conway <neilc(at)samurai(dot)com> |
|---|---|
| To: | Sibtay Abbas <sibtay_abbas(at)yahoo(dot)com> |
| Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Oid? |
| Date: | 2004-12-06 08:41:06 |
| Message-ID: | 1102322466.1494.32.camel@localhost.localdomain |
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| Lists: | pgsql-hackers |
On Mon, 2004-12-06 at 00:29 -0800, Sibtay Abbas wrote:
> i see an attribute 'oid_value' with 'Oid' type in
> the ListCell union.
>
> can anyone tell me what does it represents?
Given a linked list of type T_OidList, oid_value holds the data in a
node of the list. Although int_value and oid_value are the same size at
the moment, (a) Oid is unsigned (b) there has been some thought about
changing the size of Oid (to make it 64-bit). While (b) isn't likely to
happen anytime soon AFAIK, the two types of lists are kept separate.
This also helps to reduce the need for casting.
-Neil
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