Hi,
On Sun, Aug 21, 2022 at 11:02:04PM +0000, PG Doc comments form wrote:
> The following documentation comment has been logged on the website:
>
> Page: https://www.postgresql.org/docs/14/row-estimation-examples.html
> Description:
>
> About halfway down this page
> https://www.postgresql.org/docs/current/row-estimation-examples.html we see
> the following formula for calculating selectivity:
>
> > selectivity = (1 - sum(mvf))/(num_distinct - num_mcv)
>
> And just below the formula we see the explanatory sentence saying:
>
> > That is, add up all the frequencies for the MCVs and subtract them from
> one, ...
>
> It appears the above sentence is referring to the "(1 - sum(mvf))" portion
> 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.
