code: Format getFormat() {
      final int ordinal;
      final Flavor f = getFlavor();
      if ((f == Flavor.HYBRID) || (f == Flavor.SPARSE)) {
        ordinal = 2 | ( mergeFlag ? 0 : 1 ); //Hybrid is serialized as SPARSE
      } else {
        ordinal = ((slidingWindow != null) ? 4 : 0)
                 | (((pairTable != null) && (pairTable.getNumPairs() > 0)) ? 2 : 0)
                 | ( mergeFlag ? 0 : 1 );
      }
      return Format.ordinalToFormat(ordinal);
    }
docs: Returns the Format of the serialized form of this sketch.
  @return the Format of the serialized form of this sketch.