org.apache.datasketches.pig.theta

Class Estimate

java.lang.Object

org.apache.pig.EvalFunc<Double>

org.apache.datasketches.pig.theta.Estimate

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

Returns the unique count estimate of a sketch as a Double.

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
Estimate() Constructs with the DEFAULT_UPDATE_SEED used when deserializing the sketch.
Estimate(long seed) Constructs with the given seed.
Estimate(String seedStr) Constructs with the 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

Estimate

public Estimate()

Constructs with the DEFAULT_UPDATE_SEED used when deserializing the sketch.

Estimate

public Estimate(String seedStr)

Constructs with the given seed.

Parameters:

seedStr - the string seed used when deserializing the sketch.

Estimate

public Estimate(long seed)

Constructs with the given seed.

Parameters:

seed - used when deserializing the sketch.

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