없습니다. 

직접 만들어야 합니다. 

윗 경우라면, 

CREATE OR REPLACE FUNCTION public.intarray_element_plus(leftarr integer[], rightarr integer[])
 RETURNS integer[]
 LANGUAGE plpgsql
 IMMUTABLE
AS $function$
declare retarr int4[];
  maxlength int4;
  cnt int;
begin
    retarr := '{}'::int4[];
    maxlength := greatest(coalesce(array_upper(leftarr, 1),0), coalesce(array_upper(rightarr, 1),0));
    cnt := 1;

    if maxlength < 1 then
        raise exception 'could not calculate';
    end if;

    loop
        retarr := array_append(retarr, coalesce(leftarr[cnt], 0) + coalesce(rightarr[cnt], 0));
        cnt := cnt + 1;
        exit when cnt > maxlength;
    end loop;
    return retarr;
end;
$function$;

-- 배열 크기가 4개 고정이라면.
SELECT x
     , y
     , CONCAT( '{'
     , CONCAT_WS( ','
       , x[1] + y[1]
       , x[2] + y[2]
       , x[3] + y[3]
       , x[4] + y[4]
       ), '}')::int[] z
 FROM (SELECT '{1,2,3,4}'::int[] x
            , '{2,3,4,5}'::int[] y
       ) a
;