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Also make non-inverse query columns act as both an object pointer and a
normal column. The latter allows us to use natural expressions such as
query<employee>::employer.is_null ().
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This would be needed to support object relationships in the erase_query()
functionality.
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New test: common/erase-query. Documentation is in Section 3.9, "Deleting
Persistent Objects". The current implementation does not work well with
the session (no removal of the erased objects from the cache).
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