public BitSet isScanRequired(byte[][] blkMaxVal,byte[][] blkMinVal){
  BitSet bitSet=new BitSet(1);
  bitSet.flip(0,1);
  return bitSet;
}

public BitSet isScanRequired ( byte [ ] [ ] blkMaxVal , byte [ ] [ ] blkMinVal ) { BitSet bitSet = new BitSet ( 1 ) ; bitSet . flip ( 0 , 1 ) ; return bitSet ; }
check if scan is required on given block based on min and max value
