问如何使用JOIN FETCH完成JPQL以在一个查询中收集多个连接

EN

@Entity
public class Post {
  @Id
  private String postId;
  private String postName;
  @OneToMany(mappedBy = "Post", cascade = CascadeType.ALL)
  private Collection<PostTag> postTags = new HashSet<PostTag>();
}
@Entity
public class Tag {
  @Id
  private String tagId;
  private String tagName;
  @OneToMany(mappedBy = "tag", cascade = CascadeType.ALL)
  @JsonIgnore
  private Collection<PostTag> postTags = new HashSet<PostTag>();
}
@Entity
public class PostTag {
  @EmbeddedId
  private PostTagId postTagId = new PostTagId();
  
  @ManyToOne(fetch = FetchType.LAZY)
  @MapsId("postId")
  @JoinColumn(name = "post_Id")
  @JsonIgnore
  private Post post;
  
  @ManyToOne(fetch = FetchType.LAZY)
  @MapsId("tagId")
  @JoinColumn(name = "tag_Id")
  private Tag tag;
  
  @OneToMany(mappedBy = "posttag", cascade = CascadeType.ALL)
  @JsonIgnore
  private Set<Items> items= new HashSet<Items>();

  private String someDateField;
}
@Embeddable
public class PostTagId implements Serializable {
  private String postId;
  private String tagId;
  //equals & hashcode ommited
}
public class Items{
  @Id
  private String itemId;
  private String itemName;

  @ManyToOne(fetch = FetchType.LAZY)
  @JoinColumns({@JoinColumn(name = "post_id"), @JoinColumn(name = "tag_id")})
  @JsonBackReference
  @JsonIgnore
  private PostTag postTag;

  @OneToMany(mappedBy = "items", cascade = CascadeType.ALL)
  @JsonIgnore
  private Set<SubItems> subItems= new HashSet<SubItems>();

}
public class SubItems{
  @Id
  private String subItemId;
  private String subItemName;

  @ManyToOne(fetch = FetchType.LAZY)
  @JoinColumns({@JoinColumn(name = "itemId")})
  @JsonBackReference
  @JsonIgnore
  private Items items;

}

@Query("select po from Post po inner join fetch PostTag pt on po.postId=pt.post.postId inner join fetch Tag t on pt.tag.tagId = t.tagId")
Page<Post> findAllInOneQuery(Pageable pageable);

Hibernate: select post0_.postId as postid1_0_, post0_.postName as postname2_0_ from post post0_ inner join PostTag posttag1_ on post0_.postId=posttag1_.post_id inner join tagInfo taginfo2_ on posttag1_.tag_id=taginfo2_.tagId left outer join PostTag posttag3_ on post0_.postId=posttag3_.post_id where (taginfo2_.tagName like ?) and (posttag1_.someDateField between ? and ?) order by posttag3_.someDateField desc, posttag3_.pubDate desc offset 0 rows fetch next ? rows only
    
    Hibernate: select posttag0_.post_id as post_id1_4_0_, posttag0_.tag_id as tag_i2_4_0_, posttag0_.post_id as post_id1_4_1_, posttag0_.tag_id as tag_i2_4_1_, posttag0_.content as content3_4_1_, posttag0_.someDateField as someDateField10_4_1_ from PostTag posttag0_ where posttag0_.post_id=?
    
    Hibernate: select items0_.post_id as post_id3_1_0_, items0_.tag_id as tag_i4_1_0_, items0_.productId as producti1_1_0_, items0_.productId as producti1_1_1_, items0_.productName as productn2_1_1_, items0_.post_id as post_id3_1_1_, items0_.tag_id as tag_i4_1_1_ from Items items0_ where items0_.post_id=? and items0_.tag_id=?
    
    Hibernate: select subitems0_.productId as producti3_3_0_, subitems0_.subitemId as subitemi1_3_0_, subitems0_.subitemId as subitemi1_3_1_, subitems0_.productId as producti3_3_1_, subitems0_.subitemName as subitemn2_3_1_ from SubItems subitems0_ where subitems0_.productId=?
    
    Hibernate: select count(post0_.postId) as col_0_0_ from post post0_ inner join PostTag posttag1_ on post0_.postId=posttag1_.post_id inner join tagInfo taginfo2_ on posttag1_.tag_id=taginfo2_.tagId where (taginfo2_.tagName like ?) and (posttag1_.someDateField between ? and ?)
    
    Hibernate: select taginfo0_.tagId as tagid1_2_0_, taginfo0_.tagName as tagna2_2_0_ from tagInfo taginfo0_ where taginfo0_.tagId=?

@Query("select po.postId as postid1_0_, po.postName as postname2_0_ from post po inner join fetch PostTag pt1 inner join fetch tagInfo t left outer join fetch PostTag pt2 where (t.tagName like :tName) and (pt1.someDateField between :sDate and :eDate) order by pt2.someDateField desc")
Page<Post> findAllInOneQuery(String tName, String sDate, String eDate, Pageable pageable);

illegal attempt to dereference collection [po.postId.posttag] with element property reference [someDateField]