Hibernation Identity Primary Initiator and Foreign Keys

I looked in many places and found that hibernation with postgresql can use the IDENTITY primary key generator, which appears in the column of the serial / bigserial table. Suppose I have an entity:

@Entity
class A {

    long id;

    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
    public long getId() { return id; }

}

Works fine, and ddl looks like this:

create table A (id bigserial)

Unfortunately, any attempt to reference 'a' via @ManyToOne creates a foreign key column, which is also large.

@Entity
class B {

    // id ommitted ...

    A a;

    @ManyToOne
    public A getA() {
      return a;
    }

}

generates ddl as shown below:

create table B (..., a_id bigserial)

In most cases this will work fine. But logically this is completely wrong. a_id has nothing to do with the syntactic "data type".

Is there any way to tell hibernate to use bigint for the a_id column in table B?

columnDefinition @JoinColumn @Column . Hibernate .