From: Tom Lane <tgl@sss.pgh.pa.us>
To: Alvaro Herrera <alvherre@2ndquadrant.com>
cc: Dean Rasheed <dean.a.rasheed@gmail.com>,
        Tomas Vondra <tomas.vondra@2ndquadrant.com>,
        Alexander Korotkov <a.korotkov@postgrespro.ru>,
        Mark Dilger <hornschnorter@gmail.com>,
        PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: improving GROUP BY estimation
In-reply-to: <20160331203407.GA162729@alvherre.pgsql>
References: <20160331203407.GA162729@alvherre.pgsql>
Comments: In-reply-to Alvaro Herrera <alvherre@2ndquadrant.com>
	message dated "Thu, 31 Mar 2016 17:34:07 -0300"
Date: Thu, 31 Mar 2016 16:40:53 -0400
Message-ID: <7329.1459456853@sss.pgh.pa.us>
Precedence: bulk
Sender: pgsql-hackers-owner@postgresql.org

Alvaro Herrera <alvherre@2ndquadrant.com> writes:
> Tom Lane wrote:
>> Another minor gripe is the use of a random URL as justification.  This
>> code will still be around when that URL exists nowhere but the Wayback
>> Machine.  Can't we find a more formal citation to use?

> The article text refers to this 1977 S. B. Yao paper "Approximating
> block accesses in database organizations" which doesn't appear to be
> available online, except behind ACM's paywall at
> http://dl.acm.org/citation.cfm?id=359475 

Well, a CACM citation is perfectly fine by my lights (especially one
that's that far back and therefore certainly patent-free ...)

Let's use something like this:

See "Approximating block accesses in database organizations", S. B. Yao,
Communications of the ACM, Volume 20 Issue 4, April 1977 Pages 260-261

			regards, tom lane


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