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From: Vik Fearing <vik.fearing@2ndquadrant.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
To: Oliver Ford <ojford@gmail.com>
Cc: Erik Rijkers <er@xs4all.nl>
Cc: Pg Hackers <pgsql-hackers@postgresql.org>
Subject: Re: Add RANGE with values and exclusions clauses to the Window Functions
Date: Wed, 10 Jan 2018 00:47:59 +0100
Message-ID: <e42da773-f144-45c3-2a97-049baa896be6@2ndquadrant.com> (raw)
In-Reply-To: <13279.1515535159@sss.pgh.pa.us>
References: <CAGMVOdu9sivPAxbNN0X+q19Sfv9edEPv=HibOJhB14TJv_RCQg@mail.gmail.com>
	<b2374b9461c349b17b50c77f3a70e1a1@xs4all.nl>
	<CAGMVOdsopg5ZAuJh9+ceq-s0pU2qqZsZn-jbL4A1c=h1iWaZVA@mail.gmail.com>
	<CAGMVOdvrZCwJg0BngM9GMO+LK=j20vhSfdk1gTTBNNH311Vgsw@mail.gmail.com>
	<bc8a1d397fa81d6ae33c297d0224184b@xs4all.nl>
	<2c084c1c2bf599ceb2afa87874de8bc1@xs4all.nl>
	<CAGMVOdvETRCKpeT06Uoq5RsNUOdH7d1iYy7C1Pze=L5=gBzs-Q@mail.gmail.com>
	<cdbe62a6eaddae00fa770c09ed346fc0@xs4all.nl>
	<CAGMVOdttRSUU3=tjgdhr902HmUVL1GLQWG0ZTVXi7OY59Xo0Xw@mail.gmail.com>
	<13279.1515535159@sss.pgh.pa.us>

On 01/09/2018 10:59 PM, Tom Lane wrote:
> Generally speaking, Postgres tries hard to be an extensible-datatype
> system, going beyond the SQL standard's minimum requirements when
> necessary to make it so.  The reason that we don't already have RANGE
> PRECEDING/FOLLOWING support is that nobody was satisfied with only
> making it work for integers and datetimes.  There was, as I recall, code
> implementing more or less what you've got here in the original window
> function submission, and we pulled it out before committing because of
> that inadequacy.  I don't think the fact that some years have gone by
> means that we should forget about keeping the feature extensible.

I'm glad I read the thread before I replied.  My biggest complaint I had
in my head when reading the initial post was that clamping down on
specific datatypes was distinctly non-PostgreSQL-esque.

I'm -1 on such a patch, even though I would really like this feature.
-- 
Vik Fearing                                          +33 6 46 75 15 36
http://2ndQuadrant.fr     PostgreSQL : Expertise, Formation et Support




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