@Override
    public String toString() {
      return "TotalOrderSumTuple{" + "tuple=" + tuple + '}';
    }
ATTENTION: the order of the args is important, the larger the subscript the higher the weight
of the element when comparing sizes, e.g. (1, 2) is larger than (2, 1).

@param args input args
iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/consensus/index/ProgressIndex.java