m.put("1", "hadoop");
m.put("source", "code");
Tuple input = TupleFactory.getInstance().newTuple(m);
KEYSET keySet = new KEYSET();
DataBag result = keySet.exec(input);
Iterator<Tuple> i = result.iterator();
assertEquals(result.size(), m.size());
while(i.hasNext()) {
Tuple t = i.next();