create table ratings
(
	record_id bigserial not null
		constraint ratings_users_pk
			primary key,
	user_id integer not null,
	story_id integer not null,
	rating integer not null
);
create unique index ratings_record_id_uindex
	on ratings (record_id);
create index ratings_story_id_index
	on ratings (story_id);
create index ratings_user_id_index
	on ratings (user_id);

CREATE RECOMMENDER UserRec ON ratings
USERS FROM user_id
ITEMS FROM story_id
EVENTS FROM rating
USING userpearcf;

SELECT R.story_id, R.rating
 FROM ratings R RECOMMEND R.story_id TO R.user_id ON R.rating USING UserPearCF
 WHERE R.user_id = 1000
 ORDER BY R.rating DESC

ERROR: type mismatch in getTupleFloat()