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Mike Bayer
597f4a2032
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
(cherry picked from commit c785a528ea)