| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Cc: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>, Mark Dilger <hornschnorter(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: improving GROUP BY estimation |
| Date: | 2016-03-31 20:40:53 |
| Message-ID: | 7329.1459456853@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Alvaro Herrera <alvherre(at)2ndquadrant(dot)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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