Suppose for the following entity which contains an array field (`tags`):

@Entity
@Table(name = "movies")
public class Movie {
    @Id
    int id;
    String title;
    List<String> tags;
}

When it comes to array filtering, we have at least two options:

• array function
• HQL's `in` and `not in` feature

https://jira.mongodb.org/browse/HIBERNATE-63 has been created to implement two basic functions.

This PR aims to solve the second option. For instance, the following HQL should work as expected (internally it could be translated into comparison operator using `$in` and `$nin`):

from Movie m where :tag in m.tags

or

from Movie m where :tag not in m.tags