NEW used in a query that is not in a rule

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Hi all,
I'm bouncing on the following problem, I don't know if is a bug or if exist a different
way to do it.
The following code is not meaningfull but it's an extract of what I'm trying to do:

CREATE TABLE foo ( field1 INTEGER );

CREATE OR REPLACE FUNCTION trigger_foo()
RETURNS TRIGGER AS'
DECLARE

~ my_field TEXT;
~ my_stat TEXT;

BEGIN

~ my_field = TG_ARGV[0];

~ my_stat = ''SELECT field1 FROM foo where field1 = NEW.'' || my_field;

~ EXECUTE my_stat;

~ RETURN NEW;

END;
' LANGUAGE 'plpgsql';

CREATE TRIGGER check_foo
BEFORE INSERT ON foo
FOR EACH ROW EXECUTE PROCEDURE trigger_foo('field1');

insert into foo values ( 3 );

I got the error in the subject, it's like the EXECUTE open another contest and
forget that is inside a rule.

Any idea someone ?

Regards
Gaetano Mendola

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