Class SparseEncoding

  • All Implemented Interfaces:
    IEncode

    public class SparseEncoding
    extends Object
    implements IEncode
    Most common is zero encoding
    • Method Detail

      • combine

        public IEncode combine​(IEncode e)
        Description copied from interface: IEncode
        Combine two encodings, note it should be guaranteed by the caller that the number of unique multiplied does not overflow Integer.
        Specified by:
        combine in interface IEncode
        Parameters:
        e - The other side to combine with
        Returns:
        The combined encoding
      • getUnique

        public int getUnique()
        Description copied from interface: IEncode
        Get the number of unique values in this encoding
        Specified by:
        getUnique in interface IEncode
        Returns:
        The number of unique values.
      • extractFacts

        public EstimationFactors extractFacts​(int nRows,
                                              double tupleSparsity,
                                              double matrixSparsity,
                                              CompressionSettings cs)
        Description copied from interface: IEncode
        Extract the compression facts for this column group.
        Specified by:
        extractFacts in interface IEncode
        Parameters:
        nRows - The total number of rows
        tupleSparsity - The Sparsity of the unique tuples
        matrixSparsity - The matrix sparsity
        cs - The compression settings
        Returns:
        A EstimationFactors object
      • isDense

        public boolean isDense()
        Description copied from interface: IEncode
        Signify if the counts are including zero or without zero.
        Specified by:
        isDense in interface IEncode
        Returns:
        is dense
      • getOffsets

        public AOffset getOffsets()