I was trying switch to ImprovedNamingStrategy.
And I noticed that the column name in the create table for a @CollectionTable annotation is incorrect.

Config:

• hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect
• hibernate.hbm2ddl.auto=create-drop

Code example:

public enum Role {
    BASIC, ADMIN;
}

@Entity(name = "User_Table")
public class User {
    @ElementCollection(targetClass = Role.class)
    @CollectionTable(name = "User_Role")
    @Enumerated(EnumType.STRING)
    @Column(name = "role")
    private final Set<Role> roles = new HashSet<Role>(4);
}

For the above code snippet the following create statement is generated when ImprovedNamingStrategy is configured:

create table user_role (
        user int8 not null,
        role varchar(255)
    )

Instead of the following what is generated when ImprovedNamingStrategy is not configured.

create table User_Role (
        User_id int8 not null,
        role varchar(255)
    )

As a coincidence the generated column name "user" making the above create table statement invalid as user is a preserved keyword of PostgreSQL.