@Test
public void testEmptyInput() throws Exception{

	Row[] rows = new Row[]{
		Row.of(null, null),
		Row.of("1", null),
		Row.of(null, "1")
	};
	MemSourceBatchOp data = new MemSourceBatchOp(Arrays.asList(rows), new TableSchema(new String[]{"pred", "label"},
		new TypeInformation[]{Types.STRING, Types.STRING}));
	thrown.expect(Exception.class);
	EvalBinaryClassBatchOp op = new EvalBinaryClassBatchOp()
		.setLabelCol("label")
		.setPredictionDetailCol("pred")
		.linkFrom(data);
	op.print();
}