Re: Why is box <-> point missing, and box <-> box not indexable?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Why is box <-> point missing, and box <-> box not indexable?
Date: 2016-08-12 15:27:38
Message-ID: 29207.1471015658@sss.pgh.pa.us
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Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> writes:
> point <-> point, circle <-> point and polygon <-> point all exist as
> orderable-by-operator operators (in fact they are the only ones by
> default). But there's no box <-> point operator at all, and no index
> support for box <-> box.

> Was this intentional, or just a strange oversight?

Seems like an oversight. None of these operators have commutators,
but it seems like they all should:

<->(point,line)
<->(point,lseg)
<->(point,box)
<->(lseg,line)
<->(lseg,box)
<->(point,path)
<->(circle,polygon)
<->(line,box)

Dunno about the index-support angle.

regards, tom lane

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