Package org.apache.wayang.core.optimizer

Class ProbabilisticIntervalEstimate

java.lang.Object

org.apache.wayang.core.optimizer.ProbabilisticIntervalEstimate

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

CardinalityEstimate, LoadEstimate, TimeEstimate

public class ProbabilisticIntervalEstimate
extends Object
implements Serializable

An estimate that is capable of expressing uncertainty. The estimate addresses uncertainty in the estimation process by expressing estimates as intervals and assigning a probability of correctness (in [0, 1]).

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
ProbabilisticIntervalEstimate()
ProbabilisticIntervalEstimate(long lowerEstimate, long upperEstimate, double correctnessProb)
ProbabilisticIntervalEstimate(long lowerEstimate, long upperEstimate, double correctnessProb, boolean isOverride)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
boolean	equalsWithinDelta(ProbabilisticIntervalEstimate that, double probDelta, long lowerEstimateDelta, long upperEstimateDelta)	Compares with this instance equals with that instance within given delta bounds.
static <T extends ProbabilisticIntervalEstimate> Comparator<T>	expectationValueComparator()	Creates a Comparator based on the mean of instances.
long	getAverageEstimate()
double	getCorrectnessProbability()
long	getGeometricMeanEstimate()
long	getLowerEstimate()
long	getUpperEstimate()
int	hashCode()
boolean	isExact()	Checks whether this instance is an exact value, i.e., it is a confident single-point estimate.
boolean	isExactly(long exactEstimate)	Checks whether this instance is an exact estimate of the given value.
boolean	isOverride()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

ProbabilisticIntervalEstimate

public ProbabilisticIntervalEstimate(long lowerEstimate,
 long upperEstimate,
 double correctnessProb)

ProbabilisticIntervalEstimate

public ProbabilisticIntervalEstimate(long lowerEstimate,
 long upperEstimate,
 double correctnessProb,
 boolean isOverride)

ProbabilisticIntervalEstimate

public ProbabilisticIntervalEstimate()

Method Details

getLowerEstimate

public long getLowerEstimate()

getUpperEstimate

public long getUpperEstimate()

getAverageEstimate

public long getAverageEstimate()

getGeometricMeanEstimate

public long getGeometricMeanEstimate()

getCorrectnessProbability

public double getCorrectnessProbability()

isExactly

public boolean isExactly(long exactEstimate)

Checks whether this instance is an exact estimate of the given value.

Parameters:

exactEstimate - the hypothesized exact estimation value

Returns:

whether this instance is exactly exactEstimate

isExact

public boolean isExact()

Checks whether this instance is an exact value, i.e., it is a confident single-point estimate.

Returns:

whether this instance is exact

expectationValueComparator

public static <T extends ProbabilisticIntervalEstimate>
Comparator<T> expectationValueComparator()

Creates a Comparator based on the mean of instances.

equals

public boolean equals(Object o)

Overrides:

equals in class Object

equalsWithinDelta

public boolean equalsWithinDelta(ProbabilisticIntervalEstimate that,
 double probDelta,
 long lowerEstimateDelta,
 long upperEstimateDelta)

Compares with this instance equals with that instance within given delta bounds.

isOverride

public boolean isOverride()

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object