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Re: wip: functions median and percentile

From: David Fetter <david(at)fetter(dot)org>
To: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>,Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>,Greg Stark <gsstark(at)mit(dot)edu>,PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>,Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Subject: Re: wip: functions median and percentile
Date: 2010-08-19 17:14:58
Message-ID: 20100819171458.GB17368@fetter.org (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-rrreviewers
On Thu, Aug 19, 2010 at 12:12:12PM -0500, Kevin Grittner wrote:
> David Fetter <david(at)fetter(dot)org> wrote:
>  
> > Median may be useful, but we pretty much can't just call it
> > "median." Instead, we need to call it something like "left_median"
> > or "arithmetic_median."
>  
> I think it would be reasonable, and perhaps preferable, to use just
> "median" for the semantics described in most dictionaries -- for
> example, this:
>  
> http://www.merriam-webster.com/dictionary/median
>  
> If you do a google search for "median" and poke around, you'll find
> many places where this is the only definition mentioned; the others
> seem to be rather infrequently used.  Why not make the commone usage
> convenient?

The reason not to is the same reason that MEDIAN doesn't appear in the
SQL standard, namely that what's common in one field is wrong in
another.

Cheers,
David.
-- 
David Fetter <david(at)fetter(dot)org> http://fetter.org/
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