DataAtom field = new DataAtom(data);
Tuple input = new Tuple(field);
DataAtom output = new DataAtom();
func.exec(input, output);
assertTrue(output.strval().equals(expected));
// test schema creation
String fieldName = "field1";
AtomSchema fieldSchema = new AtomSchema(fieldName);
TupleSchema tupleSchema = new TupleSchema();