Re: stable function called for every row?

I isolated my problem a little bit:

CREATE FUNCTION get_array() RETURNS integer[] AS
$BODY$
BEGIN
  RAISE INFO 'get_array';
  RETURN ARRAY[1, 2];
END
$BODY$ LANGUAGE 'plpgsql' STABLE;

And now

SELECT * FROM generate_series(1,3) a(b) where array[b] <@ core.get_array();

gives me:

INFO:  get_array
INFO:  get_array
INFO:  get_array
 b
---
 1
 2
(2 rows)

Why?? Wlli functions which returns an array not be cached?

Regards,
  Gerhard