Re: Recursive CTE in function problem

But when I use it as a function it always returns false:

CREATE OR REPLACE FUNCTION grpl_collection.copy_in_collection_name(cpid bigint, colname text)
 RETURNS boolean
 LANGUAGE plpgsql
AS $function$
BEGIN
    RETURN cpid in (select copy from grpl_collection.collections_copy_map where copy=cpid and collection in
(WITH    RECURSIVE
        q AS
        (
        SELECT  c.id
        FROM    grpl_collection.collections c
        WHERE   name=$$colname$$

​      <<<------------​

        UNION
        SELECT  cn.id
        FROM    q
        JOIN    grpl_collection.collections cn
        ON      cn.parent = q.id
        )
SELECT id FROM q ));
END;
$function$