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Re: [COMMITTERS] pgsql: Install some slightly realistic cost estimation

From: Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au>
To: Tom Lane <tgl(at)svr1(dot)postgresql(dot)org>
Cc: Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [COMMITTERS] pgsql: Install some slightly realistic cost estimation
Date: 2005-04-21 02:35:57
Message-ID: 4267118D.50008@familyhealth.com.au (view raw or flat)
Thread:
Lists: pgsql-committerspgsql-hackers
Hi Tom,

I hate to slow you down when you're coding, but it'd be cool if you 
could explain to me (and other interested parties) what's going on here :)

Is this totally rad bitmap index support going in? :D  Does it require 
new index types or does it work with existing ones, etc?

Chris

Tom Lane wrote:
> Log Message:
> -----------
> Install some slightly realistic cost estimation for bitmap index scans.
> 
> Modified Files:
> --------------
>     pgsql/src/backend/nodes:
>         outfuncs.c (r1.247 -> r1.248)
>         (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/outfuncs.c.diff?r1=1.247&r2=1.248)
>     pgsql/src/backend/optimizer/path:
>         costsize.c (r1.142 -> r1.143)
>         (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/costsize.c.diff?r1=1.142&r2=1.143)
>         indxpath.c (r1.174 -> r1.175)
>         (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/indxpath.c.diff?r1=1.174&r2=1.175)
>         orindxpath.c (r1.67 -> r1.68)
>         (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/orindxpath.c.diff?r1=1.67&r2=1.68)
>     pgsql/src/backend/optimizer/plan:
>         createplan.c (r1.180 -> r1.181)
>         (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/createplan.c.diff?r1=1.180&r2=1.181)
>     pgsql/src/backend/optimizer/util:
>         pathnode.c (r1.116 -> r1.117)
>         (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/pathnode.c.diff?r1=1.116&r2=1.117)
>     pgsql/src/include/nodes:
>         relation.h (r1.105 -> r1.106)
>         (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/relation.h.diff?r1=1.105&r2=1.106)
>     pgsql/src/include/optimizer:
>         cost.h (r1.64 -> r1.65)
>         (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/optimizer/cost.h.diff?r1=1.64&r2=1.65)
> 
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