code: protected void readUUID(StreamReader stream, Map<String, Object> map) throws IOException
     {
        int unknown0Size = stream.getMajorVersion() > 5 ? 8 : 16;
        map.put("UNKNOWN0", stream.readBytes(unknown0Size));
        map.put("UUID", stream.readUUID());   
     }
docs: Read the optional row header and UUID.
  
  @param stream input stream
  @param map row map