v.add(collection);
v.add(collection1);
Expression es1 = new Union(v,true);
v.clear();
List resultList=(List)es1.evaluate();
// System.out.println("list "+ resultList.toString());
assertTrue(((Number)resultList.get(0)).floatValue()==(float)1.11);
assertTrue(((Number)resultList.get(1)).floatValue()==(float)2.22);
assertTrue(((Number)resultList.get(2)).floatValue()==(float)3.33);
assertTrue(((Number)resultList.get(3)).floatValue()==(float)4.44);