Re: [7.3.x] function does not exist ... ?

Marc G. Fournier wrote:

>'k, this doesn't look right, but it could be that I'm overlooking
>something ...
>
>The function I created:
>
>CREATE FUNCTION month_trunc (timestamp without time zone) RETURNS timestamp without time zone
>    AS 'SELECT date_trunc(''month'', $1 )'
>    LANGUAGE sql IMMUTABLE;
>
>
>The query that fails:
>
>ams=# select * from traffic_logs where month_trunc(runtime) = month_trunc(now());
>ERROR:  Function month_trunc(timestamp with time zone) does not exist
>        Unable to identify a function that satisfies the given argument types
>        You may need to add explicit typecasts
>
>The query that succeeds:
>
>ams=# explain select * from traffic_logs where month_trunc(runtime) = '2003-10-01';
>                                        QUERY PLAN
>-------------------------------------------------------------------------------------------
> Index Scan using tl_month on traffic_logs  (cost=0.00..30751.90 rows=8211 width=36)
>   Index Cond: (month_trunc(runtime) = '2003-10-01 00:00:00'::timestamp without time zone)
>(2 rows)
>
>I haven't mis-spelt anything that I can see ... is this something that is
>known not to be doable?
>
>  
>
Try casting now() to timestamp without time zone?

cheers

andrew