public void setHLLDenseRegister(byte[] reg) {
    int i = 0;
    for (byte b : reg) {
      denseRegister.set(i, b);
      i++;
    }
  }
Reconstruct dense registers from byte array
@param reg
         - unpacked byte array
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/common/ndv/hll/HyperLogLog.java