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https://issues.apache.org/jira/browse/OPENJPA-2041?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Rick Curtis reassigned OPENJPA-2041:
------------------------------------
Assignee: (was: Rick Curtis)
> 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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