docs: public static long getOffsetFromRollupQualifier(final byte[] qualifier, 
                    final int byte_offset, 
                    final RollupInterval interval) {
      
      long offset = 0;
      
      if ((qualifier[byte_offset] & Const.MS_BYTE_FLAG) == Const.MS_BYTE_FLAG) {
        offset = ((Bytes.getUnsignedInt(qualifier, byte_offset) & 0x0FFFFFC0) 
          >>> Const.MS_FLAG_BITS)/1000;
      } else {
        offset = (Bytes.getUnsignedShort(qualifier, byte_offset) & 0xFFFF) 
          >>> Const.FLAG_BITS;
      }
      
      return offset * interval.getIntervalSeconds() * 1000;
    }