- Fixed regression from as yet unreleased 0.9.10 where the new addition

of ``entity`` to the :attr:`.Query.column_descriptions` accessor
would fail if the target entity was produced from a core selectable
such as a :class:`.Table` or :class:`.CTE` object.
fixes #3403  references #3320

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/sqlalchemy/orm/query.py b/lib/sqlalchemy/orm/query.py
index c3638f66d..f4b04b078 100644
--- a/lib/sqlalchemy/orm/query.py
+++ b/lib/sqlalchemy/orm/query.py
@@ -2577,6 +2577,7 @@ class Query(object):
                 'expr': ent.expr,
                 'entity':
                     ent.entity_zero.entity if ent.entity_zero is not None
+                    and not inspect(ent.entity_zero).is_selectable
                     else None
             }
             for ent in self._entities
@@ -3620,7 +3621,6 @@ class _ColumnEntity(_QueryEntity):
                 if 'parententity' in elem._annotations
                 and actual_froms.intersection(elem._from_objects)
             ])
-
             if self.entities:
                 self.entity_zero = self.entities[0]
             elif self.namespace is not None: