@Data
@AllArgsConstructor
class Person {
  private String name;
  private String surname;
  private List<Friend> friends;
}

interface PersonProjection {
  String getName();
  String getSurname();
  List<Friend> getFriends();
}

@Entity
@Data
@AllArgsConstructor
class Friend { 
  private String name;
  private String surname; 
}

interface PersonRepository {
  @Query(value = "select * from customFunction()", nativeQuery = true)
  List<PersonProjection> callFunc();
}