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From "Rick Curtis (JIRA)" <>
Subject [jira] [Commented] (OPENJPA-2039) FKs for EAGER fields that are not in the current fetchplan aren't selected
Date Tue, 16 Aug 2011 14:11:30 GMT


Rick Curtis commented on OPENJPA-2039:

> a) change the doc comments on the interface to be more clear/elaborate in the user terms.

That's where I'm stumbling. I really wouldn't expect most users to have the understanding
of OpenJPA to want to control this aspect of loading. I only ran into this because of some
of the trickery I'm trying to get working. 

If you get a chance, take a look at the unit test that I put together of this change.

> FKs for EAGER fields that are not in the current fetchplan aren't selected
> --------------------------------------------------------------------------
>                 Key: OPENJPA-2039
>                 URL:
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: jdbc
>    Affects Versions: 2.1.1, 2.2.0
>            Reporter: Rick Curtis
>            Assignee: Rick Curtis
>             Fix For: 2.2.0
>         Attachments: OPENJPA-2039.failingtest.patch, 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
> 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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