@Before
  public void setUp() throws Exception {
    runner =
        Executors.newFixedThreadPool(3,
            new ThreadFactoryBuilder().setNameFormat("date-tester-thread-%d").build());
  }
Input array is used to fill the entire size of the vector row batch
ql/src/test/org/apache/hadoop/hive/ql/exec/vector/expressions/TestVectorDateExpressions.java