[postgis-devel] RE: Fixing r-tree semantics

Mark Cave-Ayland m.cave-ayland at webbased.co.uk
Fri Jun 24 08:42:19 PDT 2005


> -----Original Message-----
> From: Tom Lane [mailto:tgl at sss.pgh.pa.us] 
> Sent: 24 June 2005 14:27
> To: Mark Cave-Ayland (External)
> Cc: bwhite at frognet.net; teodor at sigaev.ru; oleg at sai.msu.su; 
> pgsql-hackers at postgresql.org; 'PostGIS Development Discussion'
> Subject: Re: Fixing r-tree semantics

(cut)

> Well, I was proposing more or less that but with ^ because of 
> the precedent of the two existing box_above/box_below 
> operator names. However, I'm quite happy to adopt your names, 
> since that's probably a more widely used precedent.  Sold, 
> unless there are objections.
> 
> (BTW, it does look a bit odd that the "|" moves around in 
> your names. But I don't dislike it enough to not follow the 
> precedent.)

The thinking behind it was that the | represents the x-axis if you tilt you
head right 90 degrees. In effect, it would allow you to 'read' the operator
without having to go and look up what it does.

> > It would be harder for us to change these operators since they already 
> > exist, but then again it would be useful from a maintenance point of 
> > view to keep the strategy numbers and operators the same across both 
> > implementations.
> 
> Agreed, I'll use your strategy number assignments too.

Alright no problems.


Many thanks,

Mark.

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