Class QuantilesDoublesUnionBuilder

java.lang.Object
org.apache.datasketches.quantiles.QuantilesDoublesUnionBuilder
public class QuantilesDoublesUnionBuilder extends Object
For building a new QuantilesDoublesSketch Union operation.
Author:
Lee Rhodes

  • Constructor Details

    • QuantilesDoublesUnionBuilder

      public QuantilesDoublesUnionBuilder()
      Constructor for a new QuantilesDoublesUnionBuilder. The default configuration is
      • k: 128. This produces a normalized rank error of about 1.7%

  • Method Details

    • setMaxK

      public QuantilesDoublesUnionBuilder setMaxK(int maxK)
      Sets the parameter masK that determines the maximum size of the sketch that results from a union and its accuracy.
      Parameters:
      maxK - determines the accuracy and size of the union and is a maximum. The effective k can be smaller due to unions with smaller k sketches. It is recommended that maxK be a power of 2 to enable unioning of sketches with different k.
      Returns:
      this builder

    • getMaxK

      public int getMaxK()
      Gets the current configured maxK
      Returns:
      the current configured maxK

    • build

      public QuantilesDoublesUnion build()
      Returns a new empty Union object with the current configuration of this Builder.
      Returns:
      a Union object

    • build

      public QuantilesDoublesUnion build(MemorySegment dstSeg, MemorySegmentRequest mSegReq)
      Returns a new empty Union object with the current configuration of this Builder and the specified backing destination MemorySegment store.
      Parameters:
      dstSeg - the destination MemorySegment
      mSegReq - the MemorySegmentRequest used if the given MemorySegment needs to expand. Otherwise, it can be null and the default MemorySegmentRequest will be used.
      Returns:
      a Union object