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Re: logical changeset generation v3 - comparison to Postgres-R change set format

From: Andres Freund <andres(at)2ndquadrant(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Hannu Krosing <hannu(at)2ndQuadrant(dot)com>, Noah Misch <noah(at)leadboat(dot)com>,Markus Wanner <markus(at)bluegap(dot)ch>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: logical changeset generation v3 - comparison to Postgres-R change set format
Date: 2013-01-13 18:02:47
Message-ID: 20130113180247.GC26173@awork2.anarazel.de (view raw or flat)
Thread:
Lists: pgsql-hackers
On 2013-01-13 12:44:44 -0500, Tom Lane wrote:
> Hannu Krosing <hannu(at)2ndQuadrant(dot)com> writes:
> > How do people feel about adding a real sameness operator ?
> 
> Just begs the question of "what's sameness?"
> 
> In many places we consider a datatype's default btree equality operator
> to define sameness, but not all types provide a btree opclass (in
> particular, anything that hasn't got a sensible one-dimensional sort
> order will not).  And some do but it doesn't represent anything that
> anyone would want to consider "sameness" --- IIRC, some of the geometric
> types provide btree opclasses that sort by area.  Even for apparently
> simple types like float8 there are interesting questions like whether
> minus zero is the same as plus zero.
> 
> The messiness here is not just due to lack of a notation.

FWIW *I* (but others might) don't plan to support that case for now, it
just seems to be too messy for far too little benefit.

Greetings,

Andres Freund

-- 
 Andres Freund	                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services


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