DataSet<Tuple5<Integer, Long, Integer, String, Long>> ds = CollectionDataSets.get5TupleDataSet(env);
DataSet<Tuple5<Integer, Long, Integer, String, Long>> ds2 = CollectionDataSets.get5TupleDataSet(env);
DataSet<Tuple5<Integer, Long, Integer, String, Long>> coGroupDs = ds.coGroup(ds2).where(0).equalTo(0).with(new Tuple5ReturnRight());
coGroupDs.writeAsCsv(resultPath);
env.execute();
// return expected result
return "1,1,0,Hallo,1\n" +
"2,2,1,Hallo Welt,2\n" +
"2,3,2,Hallo Welt wie,1\n" +