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From "Pinaki Poddar (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-845) Ordering across slice fails when ordering terms are not included in projection items
Date Tue, 23 Dec 2008 19:26:44 GMT
Ordering across slice fails when ordering terms are not included in projection items
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                 Key: OPENJPA-845
                 URL: https://issues.apache.org/jira/browse/OPENJPA-845
             Project: OpenJPA
          Issue Type: Bug
          Components: slice
            Reporter: Pinaki Poddar


Query 1: select p from Person p ORDER BY p.name
Query 2: select p, p.name from Person p ORDER BY p.name

Query 1 fails, Query 2 succeeds. The in-memory ordering required for Query 1 in terms needed
to extract the ordering value p.name from a Person p. That logic is broken for PCPath (i.e.
p.name). Inheritance hierarchy of PCPath was changed (with certain reservation as it went
against the norm) to extend kernel.exps.CandidatePath so that in-memory value evaluation logic
can be reused. However, the logic for CandidatePath does not work for PCPath because the internal
representation of the path vary (Traversal vs. Action) and are unrelated. The result is a
class cast exception (thanks to Fernando who tracked the error down).       


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