| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Jeremy Kerr <jk(at)ozlabs(dot)org>, "<pgsql-hackers(at)postgresql(dot)org>" <pgsql-hackers(at)postgresql(dot)org>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>, Gurjeet Singh <singh(dot)gurjeet(at)gmail(dot)com> |
| Subject: | Re: [PATCH] backend: compare word-at-a-time in bcTruelen |
| Date: | 2009-06-18 14:44:52 |
| Message-ID: | 1245336292.3895.221.camel@ebony.2ndQuadrant |
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| Lists: | pgsql-hackers |
On Thu, 2009-06-18 at 09:59 -0400, Tom Lane wrote:
> Simon Riggs <simon(at)2ndQuadrant(dot)com> writes:
> > Why is bcTruelen being called so many *more* times?
>
> I think you have misunderstood the context.
err, no, I just misread the original text. Possibly a worse error :-?
> It would be way nicer if we could strip trailing blanks on storage,
> and then figure a way to either reconstitute them on output (problem
> here is the output function doesn't have access to typmod) or
> language-lawyer our way to deciding we don't have to.
Is there a spare bit on the varhdr that can be set by datatypes? It
would be useful to have a bit meaning "there is a typmod stored on this
Datum", that would allow the output function to do some special
processing.
I notice we lose on tuple access also. CHAR(n) is fixed length, but is
treated as variable length for offsets.
--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Training, Services and Support
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