org.apache.datasketches.hive.cpc

Class GetEstimateAndErrorBoundsUDF

java.lang.Object

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

org.apache.datasketches.hive.cpc.GetEstimateAndErrorBoundsUDF

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

Constructor Summary

Constructors

Constructor and Description
GetEstimateAndErrorBoundsUDF()

Method Summary

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

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

GetEstimateAndErrorBoundsUDF

public GetEstimateAndErrorBoundsUDF()

Method Detail

evaluate

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

Get an estimate from a given CpcSketch using the default seed and kappa

Parameters:

serializedSketch - CpcSketch in a serialized binary form

Returns:

estimate of unique count

evaluate

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

Get an estimate and bounds from a given CpcSketch with default seed

Parameters:

serializedSketch - CpcSketch in a serialized binary form

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

Returns:

estimate, lower and upper bound

evaluate

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

Get an estimate and bounds from a given CpcSketch with explicit seed

Parameters:

serializedSketch - CpcSketch in a serialized binary form

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

seed - update seed

Returns:

estimate, lower and upper bound