Re: Not use index on setof from Sql Function

On Wed, Mar 09, 2005 at 04:49:28PM +0100, Alessandro Vincelli wrote:
>
> This simple function return setof table "DatiRegione"
>
>
> CREATE OR REPLACE FUNCTION public._stato_dati_regione_rt(text)
> RETURNS SETOF "DatiRegione" AS
> '
> SELECT DISTINCT ON ("Codice_regione") dr.* FROM "DatiRegione"
> '
> LANGUAGE 'sql' VOLATILE STRICT;

You can't do an index scan on a function. As far as the executor is
concerned, a function is an opaque object. Perhaps you actually want a
view? They allow optimisations like the one you're looking for...

Hope this helps,
--
Martijn van Oosterhout <kleptog(at)svana(dot)org> http://svana.org/kleptog/
> Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a
> tool for doing 5% of the work and then sitting around waiting for someone
> else to do the other 95% so you can sue them.