create type type1 as (doc_id <тип>, name <тип>, count_position <тип>);

create function func1(<тип>) returns setof type1 language sql as
$body$
SELECT dm.doc_id, dm.name,
zay_wh_count_position(dm.doc_id, $ 1 ) AS count_position
FROM docs dm
WHERE dm.podr_id=$ 1 ;
$body$;

select * from func1( 123 );

CREATE OR REPLACE FUNCTION test_out(_a text, IN OUT _b text, OUT _c int) LANGUAGE plpgsql AS $body$
BEGIN
  _b := _a || _b;
  _c :=  42 ;
END;
$body$;

select test_out('hello', 'world');

test_out
---------------
(helloworld, 42 )