| From: | "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com> |
|---|---|
| To: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
| Cc: | Greg Stark <gsstark(at)mit(dot)edu>, Neil Conway <neilc(at)samurai(dot)com>, Hans-J?rgen Sch?nig <postgres(at)cybertec(dot)at>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: DISTINCT vs. GROUP BY |
| Date: | 2005-09-20 19:40:41 |
| Message-ID: | 20050920194041.GR7630@pervasive.com |
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| Lists: | pgsql-hackers |
On Mon, Sep 19, 2005 at 10:16:36PM -0400, Bruce Momjian wrote:
>
> Added to TODO:
>
> * Allow DISTINCT to use hashing like GROUP BY
3 lines above we have...
Consider using hash buckets to do DISTINCT, rather than sorting
This would be beneficial when there are few distinct values.
Can you add
http://archives.postgresql.org/pgsql-hackers/2005-09/msg00810.php? All I
could find on the other TODO was
http://archives.postgresql.org/pgsql-committers/2004-09/msg00028.php,
which doesn't help much...
--
Jim C. Nasby, Sr. Engineering Consultant jnasby(at)pervasive(dot)com
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
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