return a dict, not a defaultdict

mambocab · mambocab · commit 86ff3e02e8fc · 2018-02-13T12:36:07.000-05:00
diff --git a/cassandra/metadata.py b/cassandra/metadata.py
@@ -2616,4 +2616,5 @@ def group_keys_by_replica(session, keyspace, table, keys):
             # We will group under this statement all the keys for which
             # we haven't found a valid replica
             keys_per_host[NO_VALID_REPLICA].append(key)
-    return keys_per_host
+
+    return dict(keys_per_host)
