org.apache.datasketches.pig.cpc

Class GetEstimate

java.lang.Object

org.apache.pig.EvalFunc<Double>

org.apache.datasketches.pig.cpc.GetEstimate

public class GetEstimate
extends org.apache.pig.EvalFunc<Double>

This is a User Defined Function (UDF) for getting a distinct count estimate from a given CpcdSketch

Author:

Alexander Saydakov

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.pig.EvalFunc

org.apache.pig.EvalFunc.SchemaType

Field Summary

Fields inherited from class org.apache.pig.EvalFunc

log, pigLogger, reporter, returnType

Constructor Summary

Constructors

Constructor and Description
GetEstimate() Constructor with default seed
GetEstimate(String seed) Constructor with given seed

Method Summary

Modifier and Type	Method and Description
Double	exec(org.apache.pig.data.Tuple sketchTuple)

Methods inherited from class org.apache.pig.EvalFunc

allowCompileTimeCalculation, finish, getArgToFuncMapping, getCacheFiles, getInputSchema, getLoadCaster, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, getSchemaType, getShipFiles, isAsynchronous, needEndOfAllInputProcessing, outputSchema, progress, setEndOfAllInput, setInputSchema, setPigLogger, setReporter, setUDFContextSignature, warn

Methods inherited from class java.lang.Object

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

Constructor Detail

GetEstimate

public GetEstimate()

Constructor with default seed

GetEstimate

public GetEstimate(String seed)

Constructor with given seed

Parameters:

seed - in a form of a String

Method Detail

exec

public Double exec(org.apache.pig.data.Tuple sketchTuple)
            throws IOException

Specified by:

exec in class org.apache.pig.EvalFunc<Double>

Throws:

IOException