From:
Yeb Havinga <yebhavinga(at)gmail(dot)com>
To:
Dimitri Fontaine <dfontaine(at)hi-media(dot)com>
Cc:
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Teodor Sigaev <teodor(at)sigaev(dot)ru>,
Robert Haas <robertmhaas(at)gmail(dot)com>,
Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>, tomas(at)tuxteam(dot)de,
"Ragi Y(dot) Burhum" <rburhum(at)gmail(dot)com>,
Pgsql Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject:
Re: knngist patch support
Date:
2010-02-14 16:01:28
Message-ID:
4B781E58.4060300@gmail.com (view raw or flat )
Thread:
2010-02-11 00:49:59 from "Ragi Y(dot) Burhum" <rburhum(at)gmail(dot)com>
2010-02-11 05:31:20 from tomas(at)tuxteam(dot)de
2010-02-11 06:16:09 from Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>
2010-02-11 06:49:56 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-11 08:00:20 from Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>
2010-02-11 13:18:23 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-11 14:51:46 from Greg Stark <gsstark(at)mit(dot)edu>
2010-02-11 15:23:10 from Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>
2010-02-11 15:18:46 from Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>
2010-02-12 18:14:46 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-12 20:44:58 from Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>
2010-02-12 21:14:51 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-12 21:29:26 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-13 00:30:43 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-13 02:10:19 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-13 02:27:09 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-13 02:45:18 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-13 02:57:33 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-13 03:10:30 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-13 03:18:38 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-13 03:38:18 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-13 03:39:17 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-13 18:13:19 from Teodor Sigaev <teodor(at)sigaev(dot)ru>
2010-02-13 18:28:48 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-13 18:31:44 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-13 19:03:16 from Joshua Tolley <eggyknap(at)gmail(dot)com>
2010-02-13 19:12:22 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-13 19:21:01 from Hitoshi Harada <umi(dot)tanuki(at)gmail(dot)com>
2010-02-13 20:02:36 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-13 20:48:38 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-13 20:50:57 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-13 20:59:27 from Teodor Sigaev <teodor(at)sigaev(dot)ru>
2010-02-13 19:18:56 from Hitoshi Harada <umi(dot)tanuki(at)gmail(dot)com>
2010-02-13 19:38:34 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-13 20:52:45 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-13 20:58:58 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-14 03:26:55 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-14 03:40:23 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-14 04:05:36 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-14 17:24:59 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-14 18:08:47 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-13 21:20:25 from Dimitri Fontaine <dfontaine(at)hi-media(dot)com>
2010-02-14 16:01:28 from Yeb Havinga <yebhavinga(at)gmail(dot)com>
2010-02-14 00:12:44 from Jeff Davis <pgsql(at)j-davis(dot)com>
2010-02-11 16:37:56 from Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>
2010-02-11 07:28:25 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-11 07:45:37 from "Ragi Y(dot) Burhum" <rburhum(at)gmail(dot)com>
2010-02-11 08:38:01 from Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>
2010-02-11 13:01:25 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-11 14:19:14 from Dimitri Fontaine <dfontaine(at)hi-media(dot)com>
2010-02-11 21:39:25 from tomas(at)tuxteam(dot)de
Lists:
pgsql-hackers
Dimitri Fontaine wrote:
> Then there's the metric space which is a data type with a distance
> function. This function must be non-negative, commutative, etc.
>
> So I guess what we need here is a Operator Group to define our plus and
> minus operators, and the fact that it's a group says (by convention,
> like the total ordering of a BTree) that the + is commutative and the -
> its opposite. Or we have an "option" called abelian for specifying the
> commutativity?
>
Would the group analogy work with partially ordered domains, e.g. with a
location on a sphere datatype together with an identifier for the sphere
- so poi on earth can be compared to another, but not a poi on earth
with a poi on the moon. ?
regards,
Yeb Havinga
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