add missing cache_ok directive to MyEpochType

Change-Id: Ic4da52b02a4ba36d87d73974fe428b91d9d7915c
(cherry picked from commit 4ef36de359449abd49b90726a1d06aef9a4084e7)

diff --git a/lib/sqlalchemy/sql/type_api.py b/lib/sqlalchemy/sql/type_api.py
index 9af1129cf5bd7542a0a1a0b1748b81d9139ac257..badadcec60bed2d0eb3fde19eb307ad4bae893ee 100644 (file)
--- a/lib/sqlalchemy/sql/type_api.py
+++ b/lib/sqlalchemy/sql/type_api.py
@@ -1244,6 +1244,8 @@ class TypeDecorator(ExternalType, SchemaEventTarget, TypeEngine):
         class MyEpochType(types.TypeDecorator):
             impl = types.Integer
 
+            cache_ok = True
+
             epoch = datetime.date(1970, 1, 1)
 
             def process_bind_param(self, value, dialect):