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https://issues.apache.org/jira/browse/CAY-2855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17854958#comment-17854958
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Nikita Timofeev commented on CAY-2855:
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Hi [~jhansell] I've implemented an experimental fix for this:
https://github.com/apache/cayenne/commit/b625eaea19417f9ed7787450a253712e969bed3c
I'm almost certain we need to revisit it. But probably it'll wait until we take
a big fight on the inheritance implementation that is really long in our plans.
> 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
> Assignee: Nikita Timofeev
> Priority: Major
> Fix For: 4.2.2, 5.0-M1
>
> 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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