@EntityGraph是干嘛的

@Repository
public interface UserRepository extends JpaRepository<User, Long> {
    Optional<User> findOneByActivationKey(String activationKey);

    List<User> findAllByActivatedIsFalseAndActivationKeyIsNotNullAndCreatedDateBefore(Instant dateTime);

    Optional<User> findOneByResetKey(String resetKey);

    Optional<User> findOneByEmailIgnoreCase(String email);

    Optional<User> findOneByLogin(String login);

    @EntityGraph(attributePaths = "authorities")
    Optional<User> findOneWithAuthoritiesByLogin(String login);

这是前同事写的代码，好奇这个注解有什么用

好像是用来解决n+1问题的，n+1问题是啥我也没搞懂

参考：

@EntityGraph的使用_Mosqiote的博客-CSDN博客_@entitygraph

解决JPA懒加载典型的N+1问题-注解@NamedEntityGraph - EalenXie - 博客园 (cnblogs.com)

JPA中@EntityGraph注解的作用_火山彬的博客-CSDN博客_jpa @entitygraph

JPA效率优化—@EntityGraph - 掘金 (juejin.cn)