ERROR: type mismatch in getTupleFloat() when using UserPearCF

[imhoze]

Hi, everyone!
Thanks for such an interesting implementation as recdb.

I tried to play with different options and successfully applied item-item recommenders.
But, got this problem using UserPearCF and UserCosCF recommenders

I created a rating table

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);

Then, I created a recommender for this

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

Trying to execute a query similar to the example

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

Got this error:

ERROR:  type mismatch in getTupleFloat()