Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1p4ND8-0006PG-CI for pgsql-docs@arkaria.postgresql.org; Sun, 11 Dec 2022 14:21:46 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.92) (envelope-from ) id 1p4ND6-0002tT-HP for pgsql-docs@arkaria.postgresql.org; Sun, 11 Dec 2022 14:21:44 +0000 Received: from makus.postgresql.org ([2001:4800:3e1:1::229]) by malur.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1p4ND6-0002t7-Ah for pgsql-docs@lists.postgresql.org; Sun, 11 Dec 2022 14:21:44 +0000 Received: from sss.pgh.pa.us ([66.207.139.130]) by makus.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1p4ND3-0001kv-Sa for pgsql-docs@lists.postgresql.org; Sun, 11 Dec 2022 14:21:43 +0000 Received: from sss1.sss.pgh.pa.us (localhost [127.0.0.1]) by sss.pgh.pa.us (8.15.2/8.15.2) with ESMTP id 2BBELda71637132; Sun, 11 Dec 2022 09:21:39 -0500 From: Tom Lane To: louis.xwkuang@gmail.com cc: pgsql-docs@lists.postgresql.org Subject: Re: Minor typo in sentence saving visits to heap In-reply-to: <167063189511.1901.8332207519290487949@wrigleys.postgresql.org> References: <167063189511.1901.8332207519290487949@wrigleys.postgresql.org> Comments: In-reply-to PG Doc comments form message dated "Sat, 10 Dec 2022 00:24:55 +0000" MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <1637130.1670768499.1@sss.pgh.pa.us> Date: Sun, 11 Dec 2022 09:21:39 -0500 Message-ID: <1637131.1670768499@sss.pgh.pa.us> List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk PG Doc comments form writes: > In the documentation on > https://www.postgresql.org/account/comments/new/15/indexes-multicolumn.html/ > Constraints on columns to the right of these columns are checked in the > index, so they save visits to the table proper, but they do not reduce the > portion of the index that has to be scanned. > "so they save visits to the table proper" should be "so they save visits to > the table heap". Doesn't seem like an improvement from here, especially not with one eye on the non-heap table AMs that are being worked on. regards, tom lane