No index available for ANSI join

SQL++
,
1

I’m trying to execute a simple inner join query from two documents:
user documents:
[{"id":"1", "name":"user1", "favorites": ["fav1","fav2","fav3"]},{"id":"2", "name":"user1", "favorites": ["fav4","fav5","fav6"]}]
event documents:
[{"id":"fav1", "imageName":"image1.jpg"},{"id":"fav4", "imageName":"image4.jpg"},{"id":"fav3", "imageName3":"image.jpg"}]
Query:
SELECT e.imageName FROM event e INNER JOIN user u ON meta(e).id IN u.favorites WHERE meta(u).id = '1';
Expected result:
[{"image1.jpg"},{"image3.jpg"}]
After executing it I get the error:
No index available for ANSI join term u

2 
SELECT e.imageName 
FROM  USER AS u USE KEYS "1"
JOIN event  AS e  ON KEYS u.favorites ;

OR

SELECT e.imageName 
FROM  USER AS u USE KEYS "1"
UNNEST u.favors AS f
JOIN event  AS e  ON  f = META(e).id ;