From e1bb1c9d3696a3f94e4170af20c80d2f652a71bb Mon Sep 17 00:00:00 2001
From: Tero Vuotila <tero.vuotila@fastmonkeys.com>
Date: Tue, 8 Mar 2016 15:51:01 +0200
Subject: [PATCH] Remove unnecessary argument

Providing empty dictionary is same as providing nothing.
---
 sqlalchemy_utils/aggregates.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sqlalchemy_utils/aggregates.py b/sqlalchemy_utils/aggregates.py
index da63edf..9d6431e 100644
--- a/sqlalchemy_utils/aggregates.py
+++ b/sqlalchemy_utils/aggregates.py
@@ -376,7 +376,7 @@ from .relationships import (
     select_correlated_expression
 )
 
-aggregated_attrs = WeakKeyDictionary(defaultdict(list))
+aggregated_attrs = WeakKeyDictionary()
 
 
 class AggregatedAttribute(declared_attr):