@Override String debugDecodeSortKeyBytes(byte[] bytes,int index,int length){
  StringBuilder sb=new StringBuilder();
  Util.bytesToHex(sb,bytes,index,length);
  return sb.toString();
}

@ Override String debugDecodeSortKeyBytes ( byte [ ] bytes , int index , int length ) { StringBuilder sb = new StringBuilder ( ) ; Util . bytesToHex ( sb , bytes , index , length ) ; return sb . toString ( ) ; }
decode the value to a string of hex digits .
