public void serializeTo96(IntBuffer buf) {
    buf.put((scale << 16) | (signum & 0xFF));
    this.unscaledValue.serializeTo96(buf);
  }
Serialize this object to the given ByteBuffer, putting only 96+32 bits of
data.

@param buf
         ByteBuffer to write values to
common/src/java/org/apache/hadoop/hive/common/type/Decimal128.java