@Test
public void testExceptionWithoutTypeSchema() {

	thrown.expect(ValidationException.class);
	ExecutionEnvironment env = MLEnvironmentFactory.getDefault().getExecutionEnvironment();
	DataSet<Row>  input = env.fromElements(Row.of("s1")).map(new GenericTypeMap());
	DataSetConversionUtil.toTable(MLEnvironmentFactory.DEFAULT_ML_ENVIRONMENT_ID, input, new String[] {"f0"});
}