OrderColumn does not maintain index upon inter-list element removal
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Key: OPENJPA-1074
URL: https://issues.apache.org/jira/browse/OPENJPA-1074
Project: OpenJPA
Issue Type: Bug
Components: jdbc
Affects Versions: 2.0.0
Reporter: Jeremy Bauer
Assignee: Jeremy Bauer
The current order column reordering mechanism does not maintain a contiguous
index value when an item is deleted from anywhere except the end of a
collection. Per the latest JPA 2.0 spec, a contiguous index value must be
maintained.
The current reordering mechanism does a full delete and reinsert of the
container/collection table values if a reorder is required for inserts. For
deletes, it just removes entries and leaves an empty index value. The first
phase of the fix will be to maintain contiguous ordering using the same
mechanism as inserts (delete/re-insert). The second phase will be to update
the ChangeTracker to record the indexes of the updated list items and to use
that information to provide a more intelligent update strategy in the handlers.
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