[jira] [Created] (CAY-2855) Vertical Inheritance: Fix Disjoint By Id Prefetch On Sub-Entity

["Jadon Hansell (Jira)" <ji...@apache.org>]

Jadon Hansell created CAY-2855:
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             Summary: 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
         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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