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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