CREATE OR REPLACE FUNCTION load_page(IN _session integer)
  RETURNS TABLE(col1 text, col2 text) AS
$BODY$
BEGIN
    RETURN QUERY
    select
    (SELECT array_agg(sq.*)
    FROM (SELECT user_id, user_name
          FROM "user"
          ) sq
    )::text,
    (SELECT array_agg(sq.*)
    FROM (SELECT client_id, client_name ,client_desc
          FROM "clients"
          ) sq
    )::text;
END;
$BODY$
  LANGUAGE plpgsql STABLE
  COST 100
  ROWS 1000;
ALTER FUNCTION load_page(integer) OWNER TO postgres;


The Result is :

"("{""(2,Test)"",""(5,Santhosh)"",""(3,Test1)""}","{""(1,Test1,Test1)"",""(2,test2,test2)"",""(3,test3,test3)""}")"