need the defaultdict import here

diff --git a/lib/sqlalchemy/dialects/postgresql/base.py b/lib/sqlalchemy/dialects/postgresql/base.py
index ab1327031318f9b820992bf94b501e6b0c48f02d..f9bd49f0cf15e0cfda7c3f7e2f037d52bc5875a0 100644 (file)
--- a/lib/sqlalchemy/dialects/postgresql/base.py
+++ b/lib/sqlalchemy/dialects/postgresql/base.py
@@ -206,6 +206,7 @@ version of PostgreSQL.
 
 """
 
+from collections import defaultdict
 import re
 
 from ... import sql, schema, exc, util