X-Original-To: pgsql-sql-postgresql.org@localhost.postgresql.org
Received: from localhost (unknown [200.46.204.144])
	by svr1.postgresql.org (Postfix) with ESMTP id D29D952A2F
	for <pgsql-sql-postgresql.org@localhost.postgresql.org>;
	Wed, 20 Apr 2005 12:23:19 -0300 (ADT)
Received: from svr1.postgresql.org ([200.46.204.71])
	by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024)
	with ESMTP id 34635-10
	for <pgsql-sql-postgresql.org@localhost.postgresql.org>;
	Wed, 20 Apr 2005 15:23:11 +0000 (GMT)
Received: from morework.geizhals.at (home.geizhals.at [213.229.14.34])
	by svr1.postgresql.org (Postfix) with ESMTP id 2E99A529E1
	for <pgsql-sql@postgresql.org>; Wed, 20 Apr 2005 12:23:10 -0300 (ADT)
Received: from localhost (morework [127.0.0.1])
	by morework.geizhals.at (Postfix) with ESMTP id CA1F5DEEAE
	for <pgsql-sql@postgresql.org>; Wed, 20 Apr 2005 17:23:07 +0200 (CEST)
Received: from [172.16.42.114] (unknown [172.16.42.114])
	by morework.geizhals.at (Postfix) with ESMTP
	for <pgsql-sql@postgresql.org>; Wed, 20 Apr 2005 17:23:07 +0200 (CEST)
Message-ID: <426673DA.2020203@geizhals.at>
Date: Wed, 20 Apr 2005 17:23:06 +0200
From: Marinos Yannikos <mjy@geizhals.at>
User-Agent: Mozilla Thunderbird 1.0.2 (Windows/20050317)
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: pgsql-sql@postgresql.org
Subject: Odd error message (" hash indexes do not support whole-index scans")
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Virus-Scanned: by amavisd-new-20030616-p10 at geizhals.at
X-Virus-Scanned: by amavisd-new at hub.org
X-Spam-Status: No, hits=0.05 tagged_above=0 required=5 tests=AWL,
	FORGED_RCVD_HELO
X-Spam-Level: 
X-Archive-Number: 200504/303
X-Sequence-Number: 21196

Shouldn't PostgreSQL behave in a different way in this case? (e.g. just 
not use the index):

                                           Table "public.forum_messages"

  message_id          | integer                  | not null default 
nextval('forum_messages_message_id_seq'::text)
  parent_userid       | integer                  |
  supersededby        | integer                  | default 0

     "forum_messages_pkey" primary key, btree (message_id)
     "idx_supersede" hash (supersededby) WHERE (supersededby > 0)


#  select m1.message_id,m2.message_id,m1.parent_userid,m2.parent_userid 
from forum_messages m1, forum_messages m2 where 
m2.supersededby=m1.message_id and m2.supersededby>0;
ERROR:  hash indexes do not support whole-index scans

Regards,
  Marinos