change

google/cloud/spanner_v1/database.py

@@ -627,9 +627,6 @@ def execute_partitioned_dml(
 
         if params is not None:
             from google.cloud.spanner_v1.transaction import Transaction
-
-            if param_types is None:
-                param_types = {}
             params_pb = Transaction._make_params_pb(params, param_types)
         else:
             params_pb = {}