return next in recursive function

I have found that when I use the RETURN NEXT command in recursive function,
not all records are returned. The only records I can obtain from function
are records from the highest level of recursion. Does exist some
work-around?

Thanks
Petr Bravenec

example:
create table foo (
    uid   int4,
    pid   int4
);

insert into foo values (1,0);
insert into foo values (2,0);
insert into foo values (3,0);
insert into foo values (4,1);
insert into foo values (5,1);
insert into foo values (6,5);
insert into foo values (7,5);
insert into foo values (8,2);

create or replace function foo (integer)
          returns setof foo as '
    declare pid     alias for $1;
    declare rec     RECORD;
    BEGIN
    FOR rec in select * from foo
               where foo.pid=pid LOOP
            return next rec;
            raise warning ''uid=% pid=%'',rec.uid,rec.pid;
            select into rec * from foo (rec.uid);
    END LOOP;
    return null;
    end;
' language 'plpgsql';

select * from foo(0);


The output:
WARNING:  uid=1 pid=0
WARNING:  uid=4 pid=1
WARNING:  uid=5 pid=1
WARNING:  uid=6 pid=5
WARNING:  uid=7 pid=5
WARNING:  uid=2 pid=0
WARNING:  uid=8 pid=2
WARNING:  uid=3 pid=0
 uid | pid
-----+-----
   1 |   0
   2 |   0
   3 |   0

The warnings show how the output should look.

PgSQL version 7.3.4


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