- system to cache the bind/result processors in a dialect-wide registry.

its an idea with pointy edges.

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/sqlalchemy/engine/default.py b/lib/sqlalchemy/engine/default.py
index 8647ba385..b432c351d 100644
--- a/lib/sqlalchemy/engine/default.py
+++ b/lib/sqlalchemy/engine/default.py
@@ -16,6 +16,7 @@ import re, random
 from sqlalchemy.engine import base, reflection
 from sqlalchemy.sql import compiler, expression
 from sqlalchemy import exc, types as sqltypes, util, pool
+import weakref
 
 AUTOCOMMIT_REGEXP = re.compile(
             r'\s*(?:UPDATE|INSERT|CREATE|DELETE|DROP|ALTER)',
@@ -133,7 +134,9 @@ class DefaultDialect(base.Dialect):
                     " maximum identifier length of %d" %
                     (label_length, self.max_identifier_length))
         self.label_length = label_length
-
+        
+        self._type_memos = weakref.WeakKeyDictionary()
+        
         if not hasattr(self, 'description_encoding'):
             self.description_encoding = getattr(
                                             self,