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
