org.apache.datasketches.hive.hll

Class SketchToEstimateAndErrorBoundsUDF

java.lang.Object

org.apache.hadoop.hive.ql.exec.UDF

org.apache.datasketches.hive.hll.SketchToEstimateAndErrorBoundsUDF

public class SketchToEstimateAndErrorBoundsUDF
extends org.apache.hadoop.hive.ql.exec.UDF

Constructor Summary

Constructors

Constructor and Description
SketchToEstimateAndErrorBoundsUDF()

Method Summary

Modifier and Type	Method and Description
List<Double>	evaluate(org.apache.hadoop.io.BytesWritable serializedSketch) Get an estimate and error bounds from a given HllSketch with default kappa
List<Double>	evaluate(org.apache.hadoop.io.BytesWritable serializedSketch, int kappa) Get an estimate and error bounds from a given HllSketch with explicit kappa

Methods inherited from class org.apache.hadoop.hive.ql.exec.UDF

getRequiredFiles, getRequiredJars, getResolver, setResolver

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SketchToEstimateAndErrorBoundsUDF

public SketchToEstimateAndErrorBoundsUDF()

Method Detail

evaluate

public List<Double> evaluate(org.apache.hadoop.io.BytesWritable serializedSketch)

Get an estimate and error bounds from a given HllSketch with default kappa

Parameters:

serializedSketch - HllSketch in a serialized binary form

Returns:

estimate and bounds

evaluate

public List<Double> evaluate(org.apache.hadoop.io.BytesWritable serializedSketch,
                             int kappa)

Get an estimate and error bounds from a given HllSketch with explicit kappa

Parameters:

serializedSketch - HllSketch in a serialized binary form

kappa - given number of standard deviations from the mean: 1, 2 or 3

Returns:

estimate and bounds