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From "bernard (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (OPENJPA-2041) Unnecessary Table Join in Native Many-to-Many Query generated from JPQL
Date Fri, 19 Aug 2011 09:40:27 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-2041?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

bernard updated OPENJPA-2041:
-----------------------------

    Attachment: UnneccessaryJoinManyToMany.zip

Testcase

> Unnecessary Table Join in Native Many-to-Many Query generated from JPQL
> -----------------------------------------------------------------------
>
>                 Key: OPENJPA-2041
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-2041
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: query
>    Affects Versions: 2.1.1
>         Environment: java version "1.6.0_25"
> Java(TM) SE Runtime Environment (build 1.6.0_25-b06)
> Java HotSpot(TM) Client VM (build 20.0-b11, mixed mode, sharing)
>            Reporter: bernard
>         Attachments: UnneccessaryJoinManyToMany.zip
>
>
> A rather simple JPQL query produces an unnecessary table join.
> Please refer to the attached testcase (NetBeans project).
> JPQL:
> select
>     object(emp)
> from
>     Employee emp
>     , in(emp.projects) proj
> where
>     proj.id = :projectId
> The generated native SQL is:
> SELECT
>     t0.id
>     , t0.name
> FROM
>     Employee t0
>     INNER JOIN Employee_Project t1 ON t0.id = t1.EMPLOYEE_ID
>     INNER JOIN Project t2 ON t1.PROJECTS_ID = t2.id
> WHERE (
>     t1.PROJECTS_ID = ?)
> The generated SQL should be like the following, in other words the project table should
not be included.
> SELECT
>     t1.ID
>     , t1.NAME
> FROM
>     , EMPLOYEE_PROJECT t2
>     , EMPLOYEE t1
> WHERE (
>     (t2.projects_ID = ?)
>     AND ((t2.Employee_ID = t1.ID)
> )

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