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From "Rick Curtis (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (OPENJPA-2039) FKs for EAGER fields that are not in the current fetchplan aren't selected
Date Wed, 10 Aug 2011 22:11:27 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-2039?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rick Curtis updated OPENJPA-2039:
---------------------------------

    Attachment: OPENJPA-2039.patch

Attaching the code change and a testcase.

> FKs for EAGER fields that are not in the current fetchplan aren't selected
> --------------------------------------------------------------------------
>
>                 Key: OPENJPA-2039
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-2039
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: jdbc
>    Affects Versions: 2.1.1, 2.2.0
>            Reporter: Rick Curtis
>            Assignee: Rick Curtis
>         Attachments: OPENJPA-2039.patch
>
>
> I am testing a scenario where I have an Entity with a number of eager/lazy relationships
and at runtime, using a FetchPlan, I want to mark all relationships as lazy. I was able to
hack around a bug reported previously on this list about not being able to remove fields from
a fetch plan by creating a new fetch plan, removing the default fetch group, and re-adding
all fields you want back into the new fetch plan. This all seems to work.
> I found that owned *toOne relationships that are marked as lazy via annotations we will
select the foreign keys. If the relationships were marked as eager, we don't select the foreign
keys. This is where I believe the bug is. In JDBCStoreManager.optSelect(...) we have a bit
of code that looks to see if a field is a not a part of the default fetch group, and if it
was not removed explicitly. This is wrong because for the sake of the load that is in progress,
I'm not using the default fetch group.
> With this JIRA I'd like to remove the two conditionals '!fm.isInDefaultFetchGroup() &&
!fm.isDefaultFetchGroupExplicit()' so that we will load the fks for lazy and eager marked
fields.
> This seems safe enough to do as worst case, we will select an extra field from a table
that we are already selecting from. Best case, when accessing a lazy collection, we will issue
a select by FK rather than a select with a join.

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