| From: | Heikki Linnakangas <hlinnaka(at)iki(dot)fi> |
|---|---|
| To: | Roberto Rezende de Assis <rezende_assis(at)yahoo(dot)com(dot)br> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: AGREGATE FUNCTIONS |
| Date: | 2006-06-06 17:03:13 |
| Message-ID: | Pine.OSF.4.61.0606062000210.243169@kosh.hut.fi |
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| Thread: | |
| Lists: | pgsql-hackers |
On Tue, 6 Jun 2006, Roberto Rezende de Assis wrote:
> Hello, I would like to know where in the source-code of postgres is located
> the code of the aggregate functions min, max, avg.
They're in src/backend/utils/adt/numeric.c
> I wish to develop more statistical aggregate functions, and I prefer to use C
> than to write then in the PL/R.
Make sure you read section "32.10 User-Defined aggregates" in the manual:
http://www.postgresql.org/docs/current/interactive/xaggr.html
Also, take a look at contrib/intagg for another example.
- Heikki
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