query.addExpression("SELECT outlook, windy, temperature, humidity, weather.play FROM weather JOIN measurements ON weather.id = measurements.id");
workflow.add(query);
ListRandomSplit split = new ListRandomSplit();
split.setNumberOfOutputs(count);
split.connectDataInput(query.getDataOutput());
workflow.add(split);
TupleUnionAll[] union = new TupleUnionAll[count];
BuildClassifier[] classifier = new BuildClassifier[count];
TupleToWebRowSetCharArrays[] tupleToWRS = new TupleToWebRowSetCharArrays[count];