Re: improving GROUP BY estimation

On 31 March 2016 at 21:40, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> 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
>

Sounds good.

Regards,
Dean