> -----Original Message-----
> From: pgsql-patches-owner(at)postgresql(dot)org
> [mailto:pgsql-patches-owner(at)postgresql(dot)org] On Behalf Of Tom Lane
> Sent: 13 February 2004 14:41
> To: Mark Cave-Ayland
> Cc: pgsql-patches(at)postgresql(dot)org
> Subject: Re: [PATCHES] ANALYZE patch for review
> "Mark Cave-Ayland" <m(dot)cave-ayland(at)webbased(dot)co(dot)uk> writes:
> > The only reason I kept the Relation parameter
> > was because I wasn't sure if there was a historical reason
> why someone
> > would need the relation information as well as the attribute
> > information.
> I can't think of one, but if someone did, they could extract
> the relation OID from the pg_attribute row and re-open it for
> themselves. So AFAICS this API does not omit any critical info.
> I forgot to email you about the fetch_function revision, but
> I trust it meets with your approval. Right now it's just a
> wrapper around heap_fetch, but I thought we might conceivably
> want something different when we do functional-index stats.
> The fetch function will give us wiggle room if we need it.
Yep no problems as long as the functionality is there. I think I can
also see where you're going with functional indexes - during an analyze
phase, for a column X, a pseudo-column f(X) is generated from the sample
data before the stats calculation is performed and the results dropped
into pg_statistic. Hopefully this now shouldn't be too difficult for
someone to pick it up and run with it.
Tamar Science Park
Tel: +44 (0)1752 764445
Fax: +44 (0)1752 764446
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