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15b23c7f71
:class:`.Query` and in other situations where selects or joins were aliased (such as joined table inheritance) could fail if a user-defined :class:`.Column` subclass were used in the expression. In this case, the subclass would fail to propagate ORM-specific "annotations" along needed by the adaptation. The "expression annotations" system has been corrected to account for this case. [ticket:2918]