Re: 'infinity' in GiST index - Mailing list pgsql-hackers

From Oleg Bartunov
Subject Re: 'infinity' in GiST index
Date
Msg-id Pine.GSO.4.62.0505052341430.18597@ra.sai.msu.su
Whole thread Raw
In response to Re: 'infinity' in GiST index  ("Dave Held" <dave.held@arraysg.com>)
Responses Re: 'infinity' in GiST index  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-hackers
On Thu, 5 May 2005, Dave Held wrote:

>
>> but I doubt GiST will be happy if we make the datatype behave
>> that way...
>
> I guess it depends on why you want to take the difference.  If
> you want to take some measure of distance, it might be useful
> to say that all infinite values of the same sign are at 0 distance
> from each other, in which case you would say that +w - +w = 0.
> Probably infinities of opposite signs should just be w apart
> (which is also mathematically consistent).

actually, it's timestamp_mi function rise the error which prevent
GiST index creation.

>
> __
> David B. Held
> Software Engineer/Array Services Group
> 200 14th Ave. East,  Sartell, MN 56377
> 320.534.3637 320.253.7800 800.752.8129
>
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 9: the planner will ignore your desire to choose an index scan if your
>      joining column's datatypes do not match
>
    Regards,        Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83


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