[hibernate-issues] [Hibernate-JIRA] Updated: (HHH-5257) @JoinTable results in redundant join in the generated SQL

[John Verhaeg (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5257?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

John Verhaeg updated HHH-5257:
------------------------------

    Fix Version/s:     (was: 4.0.1)

> @JoinTable results in redundant join in the generated SQL
> ---------------------------------------------------------
>
>                 Key: HHH-5257
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5257
>             Project: Hibernate Core
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 3.5.2
>            Reporter: Sharath Reddy
>            Assignee: John Verhaeg
>            Priority: Minor
>         Attachments: testcase.zip
>
>
> An Account can have several Clients:
> @Entity
> @Table(name = "CLIENT")
> public class Client implements Serializable {
> private String street;
> private String code;
> private String city;
> @Id
> @GeneratedValue(strategy = GenerationType.IDENTITY)
> private int id;
> @ManyToOne
> @JoinTable(name = "CLIENT_ACCOUNT",
> joinColumns = {@JoinColumn(name = "FK_CLIENT", referencedColumnName = "ID")},
> inverseJoinColumns = {@JoinColumn(name = "FK_ACCOUNT", referencedColumnName = "ID")})
> private Account account;
> .....
> }
> @Entity
> @Table(name = "ACCOUNT")
> public class Account implements Serializable {
> @Id
> @GeneratedValue(strategy = GenerationType.IDENTITY)
> private int id;
> private String number;
> private double balance;
> @OneToMany (fetch = FetchType.EAGER, mappedBy="account")
> private Set<Client> holders;
> ...
> }
> When we load the Account entity:
> Account a1 = (Account) session.load(Account.class, accountId);
> We see that there is a redundant join at the end - from the CLIENT table to the CLIENT_ACCOUNT table:
> select
> account0_.id as id2_1_,
> account0_.balance as balance2_1_,
> account0_.number as number2_1_,
> holders1_.FK_ACCOUNT as FK1_2_3_,
> client2_.id as FK2_3_,
> client2_.id as id0_0_,
> client2_.city as city0_0_,
> client2_.code as code0_0_,
> client2_.street as street0_0_,
> client2_1_.FK_ACCOUNT as FK1_1_0_
> from
> ACCOUNT account0_
> left outer join
> CLIENT_ACCOUNT holders1_
> on account0_.id=holders1_.FK_ACCOUNT
> left outer join
> CLIENT client2_
> on holders1_.FK_CLIENT=client2_.id
> left outer join
> CLIENT_ACCOUNT client2_1_
> on client2_.id=client2_1_.FK_CLIENT
> where
> account0_.id=?

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