From: Tom Lane <tgl@sss.pgh.pa.us>
To: Julien Rouhaud <rjuju123@gmail.com>
cc: Daniel Gustafsson <daniel@yesql.se>, eric.mutta@gmail.com,
        pgsql-docs@lists.postgresql.org
Subject: Re: Should 'sum(mvf)' read 'sum(mcv)'...?
In-reply-to: <20220822074837.dy4i5t7n5xmbhjbw@jrouhaud>
References: <166112292492.654.5377188452604176150@wrigleys.postgresql.org>
 <20220822074837.dy4i5t7n5xmbhjbw@jrouhaud>
Comments: In-reply-to Julien Rouhaud <rjuju123@gmail.com>
	message dated "Mon, 22 Aug 2022 15:48:37 +0800"
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-ID: <255693.1661173111.1@sss.pgh.pa.us>
Content-Transfer-Encoding: quoted-printable
Date: Mon, 22 Aug 2022 08:58:31 -0400
Message-ID: <255694.1661173111@sss.pgh.pa.us>
Archived-At: 
 <https://www.postgresql.org/message-id/255694.1661173111%40sss.pgh.pa.us>
Precedence: bulk

Julien Rouhaud <rjuju123@gmail.com> writes:
> On Sun, Aug 21, 2022 at 11:02:04PM +0000, PG Doc comments form wrote:
>> It appears the above sentence is referring to the "(1 - sum(mvf))" port=
ion
>> of the formula, however I am not sure what "mvf" is referring to
>> there...shouldn't it be "(1 - sum(mcv))" in order to match what the
>> explanatory sentence is saying?

> It should be mcf, ie. Most Common Frequencies.  It looks like a very old=
 typo
> that survived until now.

I don't think it's a typo exactly, but an odd abbreviation for "Most
common Values' Frequencies".  (Summing the MCVs themselves isn't
sensible; they might not even be numeric.)

I'd vote for replacing mvf in both places with something a bit more
spelled-out, perhaps "mcv_freqs".

			regards, tom lane