org.apache.datasketches.hive.cpc

Class GetEstimateUDF

java.lang.Object

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

org.apache.datasketches.hive.cpc.GetEstimateUDF

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

Constructor Summary

Constructors

Constructor and Description
GetEstimateUDF()

Method Summary

Modifier and Type	Method and Description
Double	evaluate(org.apache.hadoop.io.BytesWritable serializedSketch) Get an estimate from a given CpcSketch using the default seed
Double	evaluate(org.apache.hadoop.io.BytesWritable serializedSketch, long seed) Get an estimate 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

GetEstimateUDF

public GetEstimateUDF()

Method Detail

evaluate

public Double evaluate(org.apache.hadoop.io.BytesWritable serializedSketch,
                       long seed)

Get an estimate from a given CpcSketch with explicit seed

Parameters:

serializedSketch - CpcSketch in a serialized binary form

seed - update seed

Returns:

estimate of unique count

evaluate

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

Get an estimate from a given CpcSketch using the default seed

Parameters:

serializedSketch - CpcSketch in a serialized binary form

Returns:

estimate of unique count