BUG #3587: EXECUTE and trigger problem

The following bug has been logged online:

Bug reference:      3587
Logged by:          cyrus
Email address:      cdowney@pryermachine.com
PostgreSQL version: 8.1.9
Operating system:   i686-redhat-linux-gnu
Description:        EXECUTE and trigger problem
Details:

I am having problems using the Old record as part of the dynamic command
passed to the Execute statement in a trigger.

The error recived was:
ERROR:  OLD used in query that is not in a rule
CONTEXT:  SQL statement "INSERT INTO public.test_hist  SELECT  OLD.* from
OLD;"
PL/pgSQL function "hist_insert_tr" line 8 at execute statement

Below is the DDL I used to replicate the problem.

create table public.test(itest integer);
create table public.test_hist(      itest integer,
                             "dmodified" TIMESTAMP WITHOUT TIME ZONE DEFAULT
now() NOT NULL
                             );


CREATE OR REPLACE FUNCTION public.hist_insert_tr () RETURNS trigger AS
$body$
declare
       lcDynamicSQL varchar := '';
BEGIN
       --does not work
       --lcDynamicSQL := 'INSERT INTO public.' || TG_ARGV[0] || '_hist
SELECT  OLD.*;';
       --does not work
       lcDynamicSQL := 'INSERT INTO public.' || TG_ARGV[0] || '_hist  SELECT
 OLD.* from OLD;';
       EXECUTE lcDynamicSQL;
       RETURN NULL;
END;
$body$
LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;


CREATE TRIGGER test_after_tr AFTER UPDATE
ON public.test FOR EACH ROW
EXECUTE PROCEDURE public.hist_insert_tr(test);



insert into test (itest) VALUES(1);
update test set itest = 2;



drop table public.test cascade;
drop table public.test_hist;
DROP FUNCTION public.hist_insert_tr();