com.yahoo.sketches.hive.tuple.package-info Maven / Gradle / Ivy
/*
* Copyright 2016, Yahoo! Inc. Licensed under the terms of the Apache License 2.0. See LICENSE file
* at the project root for terms.
*/
/**
* Hive UDFs for Tuple sketches.
* Tuple sketches are based on the idea of Theta sketches with the addition of
* values associated with unique keys.
* Two sets of tuple sketch classes are available at the moment:
* generic Tuple sketches with user-defined Summary, and a faster specialized
* implementation with an array of double values.
*
* There are two sets of Hive UDFs: one for generic Tuple sketch with an example
* implementation for DoubleSummay, and another one for a specialized ArrayOfDoublesSketch.
*
*
The generic implementation is in the form of abstract classes DataToSketchUDAF and
* UnionSketchUDAF to be specialized for particular types of Summary.
* An example implementation for DoubleSumamry is provided: DataToDoubleSummarySketchUDAF and
* UnionDoubleSummarySketchUDAF, as well as UDFs to obtain the results from sketches:
* DoubleSumamrySketchToEstimatesUDF and DoubleSummarySketchToPercentileUDF.
*
*
UDFs for ArrayOfDoublesSketch: DataToArrayOfDoublesSketchUDAF, UnionArrayOfDoublesSketchUDAF,
* ArrayOfDoublesSketchToEstimatesUDF, ArrayOfDoublesSketchToValuesUDTF.
*
* @author Alexander Saydakov
*/
package com.yahoo.sketches.hive.tuple;