@Override
  public void writeListBegin(TList list) throws TException {
    stackLevel++;
    if (list == null) {
      writeRawBytes(nonNullByte, 0, 1);
    } else {
      writeI32(list.size);
    }
  }
Whether the current field is sorted ascendingly. Always equals to
sortOrder.charAt(topLevelStructFieldID) != '-'
serde/src/java/org/apache/hadoop/hive/serde2/thrift/TBinarySortableProtocol.java