OneToOne关系和带可选字段的DTO投影(INNER JOIN)

我有一个实体:

public class Bird {
@Id
@GeneratedValue(strategy = IDENTITY)
private Long id;
@OneToOne(optional = true)
@Fetch(FetchMode.JOIN)
@JoinColumn(name = "current_transmitter_id", nullable = true)
private Transmitter currentTransmitter;
....
}

不是每只鸟都有 CurrentTransmitter 相关。

我的DTO投影查询是:

@Query("SELECT NEW com.contoso.view.BirdSummaryDTO(b.name, b.sex, b.currentTransmitter ) FROM Bird b")
List<BirdSummaryDTO> listBirdDTO();

BirdSummaryDTO看起来像:

public class BirdSummaryDTO {

final String name;
final String sex;
final Transmitter currentTransmitter;

public BirdSummaryDTO(Integer id, Transmitter currentTransmitter) {
    this.name = name;
    this.sex = sex;
    this.currentTransmitter = currentTransmitter;
}

然而,我的查询只返回有发射器的鸟。它正在使用INNER JOIN。

问: 是否有注释或方法使其返回所有鸟类,无论它们是否有电流发射器?