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Mike Bayer
c785a528ea
Fixed regression where new association proxy system was still not proxying hybrid attributes when they made use of the ``@hybrid_property.expression`` decorator to return an alternate SQL expression, or when the hybrid returned an arbitrary :class:`.PropComparator`, at the expression level. This involved futher generalization of the heuristics used to detect the type of object being proxied at the level of :class:`.QueryableAttribute`, to better detect if the descriptor ultimately serves mapped classes or column expressions. Fixes: #4690 Change-Id: I5b5300661291c94a23de53bcf92d747701720aa1