this function can help with array's iteration.

create function generate_iterator(anyarray)
returns setof integer
as $$
select i
  from generate_series(array_lower($1,1),
                                       array_upper($1,1)) g(i)
$$ language sql;

-- multidimensional
create function generate_iterator(anyarray, integer)
returns setof integer
as $$
select generate_series(array_lower($1,$2),
                                      array_upper($1,$2)) g(i)
$$ language sql;

It can be internal function, not only shortcut for generate_series


create function array_sort(anyarray)
returns anyarray
as $$
select array(select $1[i] from generate_iterator($1) order by 1)
$$ language sql;

---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not

Reply via email to