private static long cellTimestampOrLatest(QualifierValue cell) {
    if (cell.hasTimestamp()) {
      return cell.getTimestamp();
    } else {
      return HConstants.LATEST_TIMESTAMP;
    }
  }
Convert a protocol buffer Mutate to a Delete
@param proto       the protocol buffer Mutate to convert
@param cellScanner if non-null, the data that goes with this delete.
@return the converted client Delete
hbase-client/src/main/java/org/apache/hadoop/hbase/shaded/protobuf/ProtobufUtil.java