PrepareStatement should support is_idempotent

CHANGELOG.rst

@@ -1,3 +1,10 @@
+3.11
+====
+
+Bug Fixes
+---------
+* is_idempotent flag is not propagated from PreparedStatement to BoundStatement (PYTHON-736)
+
 3.10.0
 ======
 May 24, 2017

cassandra/query.py

@@ -496,7 +496,8 @@ class BoundStatement(Statement):
             self.keyspace = meta[0].keyspace_name
 
         Statement.__init__(self, retry_policy, consistency_level, routing_key,
-                           serial_consistency_level, fetch_size, keyspace, custom_payload)
+                           serial_consistency_level, fetch_size, keyspace, custom_payload,
+                           prepared_statement.is_idempotent)
 
     def bind(self, values):
         """

tests/integration/standard/test_policies.py

@@ -112,6 +112,16 @@ class SpecExecTest(BasicSharedKeyspaceUnitTestCase):
         with self.assertRaises(OperationTimedOut):
             result = self.session.execute(statement, execution_profile='spec_ep_rr', timeout=.5)
 
+        # PYTHON-736 Test speculation policy works with a prepared statement
+        statement = self.session.prepare("SELECT timeout(100) FROM d WHERE k = ?")
+        # non-idempotent
+        result = self.session.execute(statement, (0,), execution_profile='spec_ep_brr')
+        self.assertEqual(1, len(result.response_future.attempted_hosts))
+        # idempotent
+        statement.is_idempotent = True
+        result = self.session.execute(statement, (0,), execution_profile='spec_ep_brr')
+        self.assertLess(1, len(result.response_future.attempted_hosts))
+
     #TODO redo this tests with Scassandra
     def test_speculative_and_timeout(self):
         """