| From: | Greg Stark <gsstark(at)mit(dot)edu> |
|---|---|
| To: | Markus Schaber <schabi(at)logix-tt(dot)com> |
| Cc: | pgsql-performance(at)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: qsort again (was Re: [PERFORM] Strange Create Index |
| Date: | 2006-02-16 22:51:02 |
| Message-ID: | 871wy23okp.fsf@stark.xeocode.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers pgsql-performance |
Markus Schaber <schabi(at)logix-tt(dot)com> writes:
> Hmm, to remove redundancy, I'd change the <= to a < and define:
>
> if a==b then f(a)==f(b)
> if a<b then f(a)<=f(b)
>
> > Data types which could probably provide a useful function for f would be
> > int2, int4, oid, and possibly int8 and text (at least for SQL_ASCII).
How exactly do you imagine doing this for text?
I could see doing it for char(n)/varchar(n) where n<=4 in SQL_ASCII though.
--
greg
| From | Date | Subject | |
|---|---|---|---|
| Next Message | PFC | 2006-02-16 23:05:23 | Re: [HACKERS] qsort again (was Re: Strange Create Index |
| Previous Message | Martijn van Oosterhout | 2006-02-16 22:40:06 | Re: qsort again (was Re: [PERFORM] Strange Create Index |
| From | Date | Subject | |
|---|---|---|---|
| Next Message | PFC | 2006-02-16 23:05:23 | Re: [HACKERS] qsort again (was Re: Strange Create Index |
| Previous Message | Martijn van Oosterhout | 2006-02-16 22:40:06 | Re: qsort again (was Re: [PERFORM] Strange Create Index |