On Wed, Mar 23, 2011 at 8:03 AM, Disc Magnet <discmagnet@gmail.com> wrote:
> I was learning how to create my own aggregate functions from
> http://www.postgresql.org/docs/9.0/static/xaggr.html
>
> I copied the avg() example as
>
> CREATE TABLE numbers (
> value integer
> );
>
> insert into numbers values (2);
> insert into numbers values (3);
> insert into numbers values (4);
>
> CREATE AGGREGATE myavg(float8) (
> sfunc = float8_accum,
> stype = float8[],
> finalfunc = float8_avg,
> initcond = '{0,0}'
> );
>
> On trying to run this, I get this error:
>
> cdb=# select myavg(value) from numbers;
> ERROR: float8_accum: expected 3-element float8 array
>
> How can I fix this?
how embarrassing -- the initcont should be: '{0,0,0}' :^).
merlin
