code: public ArrayWritable getValueArrayWritable(String label) {
          HadoopObject o = getHadoopObject(VALUE, label, ObjectUtil.ARRAY, "Array");
          if (o == null) {
              return null;
          }
  
          return (ArrayWritable) o.getObject();
      }
docs: Get value {@link ArrayWritable} value
  @param label target label
  @return {@link ArrayWritable} value of the label. If it is not null.