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The attributeimpl for a deferred_expression does not support a scalar loader, add new configurability so that the impl can have this flag turned off. Document that the with_expression() system currently does not offer any deferred loading. To eliminate confusion over "deferred", which refers to lazy loading of column attributes, and "with_expression", which refers to an attribute that is explicitly at query time only, rename deferred_expression to query_expression. Change-Id: I07c4a050ed68c79ccbde9492e9de1630b7470d74