- this is small optimization, currently it's the best we can do

for #3175.  fixes #3175 (for now)

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/sqlalchemy/sql/annotation.py b/lib/sqlalchemy/sql/annotation.py
index 02f5c3c1c..3df4257d4 100644
--- a/lib/sqlalchemy/sql/annotation.py
+++ b/lib/sqlalchemy/sql/annotation.py
@@ -46,6 +46,7 @@ class Annotated(object):
         self.__dict__ = element.__dict__.copy()
         self.__element = element
         self._annotations = values
+        self._hash = hash(element)
 
     def _annotate(self, values):
         _values = self._annotations.copy()
@@ -87,7 +88,7 @@ class Annotated(object):
             return self.__class__(clone, self._annotations)
 
     def __hash__(self):
-        return hash(self.__element)
+        return self._hash
 
     def __eq__(self, other):
         if isinstance(self.__element, operators.ColumnOperators):