@Override public void readFields(DataInput input) throws IOException { // read/write type ordinal, maxLength presence, scale presence and isNullable bit together to // save space int typeAndFlag = WritableUtils.readVInt(input); isNullable = (typeAndFlag & 0x01) != 0; if ((typeAndFlag & 0x02) != 0) { scale = WritableUtils.readVInt(input); } if ((typeAndFlag & 0x04) != 0) { maxLength = WritableUtils.readVInt(input); } type = PDataType.values()[typeAndFlag >>> 3]; sortOrder = SortOrder.fromSystemValue(WritableUtils.readVInt(input)); }