Package org.apache.datasketches.quantilescommon

Interface PartitioningFeature<T>

All Known Implementing Classes:

ItemsSketch, ItemsSketchSortedView, KllItemsSketch, KllItemsSketchSortedView

public interface PartitioningFeature<T>

This enables the special functions for performing efficient partitioning of massive data.

Method Summary

Modifier and Type	Method	Description
default GenericPartitionBoundaries<T>	getPartitionBoundaries(int numEquallySized)	This method returns an instance of GenericPartitionBoundaries which provides sufficient information for the user to create the given number of equally sized partitions, where "equally sized" refers to an approximately equal number of items per partition.
GenericPartitionBoundaries<T>	getPartitionBoundaries(int numEquallySized, QuantileSearchCriteria searchCrit)	This method returns an instance of GenericPartitionBoundaries which provides sufficient information for the user to create the given number of equally sized partitions, where "equally sized" refers to an approximately equal number of items per partition.

Method Detail

getPartitionBoundaries

default GenericPartitionBoundaries<T> getPartitionBoundaries(int numEquallySized)

This method returns an instance of GenericPartitionBoundaries which provides sufficient information for the user to create the given number of equally sized partitions, where "equally sized" refers to an approximately equal number of items per partition.

This method is equivalent to getPartitionBoundaries(numEquallySized, INCLUSIVE).

Parameters:

numEquallySized - an integer that specifies the number of equally sized partitions between getMinItem() and getMaxItem(). This must be a positive integer greater than zero.

• A 1 will return: minItem, maxItem.
• A 2 will return: minItem, median quantile, maxItem.
• Etc.

Returns:

an instance of GenericPartitionBoundaries.

Throws:

IllegalArgumentException - if sketch is empty.

IllegalArgumentException - if numEquallySized is less than 1.

getPartitionBoundaries

GenericPartitionBoundaries<T> getPartitionBoundaries(int numEquallySized,
                                                     QuantileSearchCriteria searchCrit)

This method returns an instance of GenericPartitionBoundaries which provides sufficient information for the user to create the given number of equally sized partitions, where "equally sized" refers to an approximately equal number of items per partition.

Parameters:

numEquallySized - an integer that specifies the number of equally sized partitions between getMinItem() and getMaxItem(). This must be a positive integer greater than zero.

• A 1 will return: minItem, maxItem.
• A 2 will return: minItem, median quantile, maxItem.
• Etc.

searchCrit - If INCLUSIVE, all the returned quantiles are the upper boundaries of the equally sized partitions with the exception of the lowest returned quantile, which is the lowest boundary of the lowest ranked partition. If EXCLUSIVE, all the returned quantiles are the lower boundaries of the equally sized partitions with the exception of the highest returned quantile, which is the upper boundary of the highest ranked partition.

Returns:

an instance of GenericPartitionBoundaries.

Throws:

IllegalArgumentException - if sketch is empty.

IllegalArgumentException - if numEquallySized is less than 1.