@Override
  public void writeI64(long i64) throws TException {
    i64out[0] = (byte) (0xff & ((i64 >> 56) ^ 0x80));
    i64out[1] = (byte) (0xff & (i64 >> 48));
    i64out[2] = (byte) (0xff & (i64 >> 40));
    i64out[3] = (byte) (0xff & (i64 >> 32));
    i64out[4] = (byte) (0xff & (i64 >> 24));
    i64out[5] = (byte) (0xff & (i64 >> 16));
    i64out[6] = (byte) (0xff & (i64 >> 8));
    i64out[7] = (byte) (0xff & (i64));
    writeRawBytes(nonNullByte, 0, 1);
    writeRawBytes(i64out, 0, 8);
  }
Whether the current field is sorted ascendingly. Always equals to
sortOrder.charAt(topLevelStructFieldID) != '-'
serde/src/java/org/apache/hadoop/hive/serde2/thrift/TBinarySortableProtocol.java