From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
---|---|
To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Andrew Dunstan <andrew(at)dunslane(dot)net>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: t_self as system column |
Date: | 2010-07-07 17:29:04 |
Message-ID: | 1278523544-sup-4241@alvh.no-ip.org |
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Thread: | |
Lists: | pgsql-hackers |
Excerpts from Robert Haas's message of mar jul 06 17:24:21 -0400 2010:
> On Tue, Jul 6, 2010 at 5:18 PM, Andrew Dunstan <andrew(at)dunslane(dot)net> wrote:
> > In any case, having a mutable logical column
> > position is the feature that's been most requested.
>
> I think that's true. But the physical storage position would give us
> a performance benefit, by allowing us to try to avoid useless
> alignment padding.
That's true too. I intend to look at both problems simultaneously, i.e.
decoupling the current attnum in three columns as previously discussed;
as Tom says, I think it'll end up being less work than attacking them
separately. However, I will not attempt to include optimizations such
as avoiding padding, in the first patch, just the possibility that it is
added later.
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