DistributedRequestContextManager contextManager =
new DistributedRequestContextManager(new DummyDownstreamOperationFactory(rows), functions,
new StatsTables(ImmutableSettings.EMPTY, mock(NodeSettingsService.class)));
contextManager.createContext(dummyMergeNode, new NoopActionListener());
Streamer<?>[] streamers = new Streamer[2];
streamers[0] = DataTypes.INTEGER.streamer();
streamers[1] = DataTypes.STRING.streamer();