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https://issues.apache.org/jira/browse/CAY-2855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17851170#comment-17851170
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Jadon Hansell commented on CAY-2855:
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I've attached a patch containing a breaking test (and similar tests for the
other prefetch types).
Once I added the relationship for the test a couple other tests in the file
started to fail because {{IvImpl}} was inserted with a foreign key to
{{IvOther}} before the corresponding {{IvOther}} row was inserted. I'm thinking
that might be a separate existing issue.
> Vertical Inheritance: Fix Disjoint By Id Prefetch On Sub-Entity
> ---------------------------------------------------------------
>
> Key: CAY-2855
> URL: https://issues.apache.org/jira/browse/CAY-2855
> Project: Cayenne
> Issue Type: Bug
> Affects Versions: 4.2
> Reporter: Jadon Hansell
> Priority: Major
> Attachments: disjoint-by-id-issue.patch
>
>
> I ran into an issue with prefetching a belongs-to relationship whose target
> was the sub-entity of a vertical inheritance scenario. When {{disjointById}}
> is used, the select for the sub-entity looks for an ID of {{null}} instead of
> the actual ID assigned to the relationship.
> For example, lets say I have a base entity {{Base}}, a vertically inherited
> sub-entity {{Impl}}, and a separate entity called {{Other}}.
> If {{Other}} has a belongs-to relationship to {{Impl}} called
> {{Other.impl}}, attempting to use a {{disjointById}} prefetch on that
> relationship will always find no results.
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