org.apache.hadoop.hive.ql.udf.generic

Class NumDistinctValueEstimator

java.lang.Object

org.apache.hadoop.hive.ql.udf.generic.NumDistinctValueEstimator

Direct Known Subclasses:

DecimalNumDistinctValueEstimator, DoubleNumDistinctValueEstimator, LongNumDistinctValueEstimator, StringNumDistinctValueEstimator

public class NumDistinctValueEstimator
extends Object

Constructor Summary

Constructors

Constructor and Description
NumDistinctValueEstimator(int numBitVectors)
NumDistinctValueEstimator(String s, int numBitVectors)

Method Summary

Methods

Modifier and Type	Method and Description
void	addToEstimator(double d)
void	addToEstimator(HiveDecimal decimal)
void	addToEstimator(long v)
void	addToEstimatorPCSA(double d)
void	addToEstimatorPCSA(HiveDecimal decimal)
void	addToEstimatorPCSA(long v)
long	estimateNumDistinctValues()
long	estimateNumDistinctValuesPCSA()
javolution.util.FastBitSet	getBitVector(int index)
int	getBitVectorSize()
int	getnumBitVectors()
void	mergeEstimators(NumDistinctValueEstimator o)
void	printNumDistinctValueEstimator()
void	reset() Resets a distinctValueEstimator object to its original state.
org.apache.hadoop.io.Text	serialize()

Methods inherited from class java.lang.Object

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

Constructor Detail

NumDistinctValueEstimator

public NumDistinctValueEstimator(int numBitVectors)

NumDistinctValueEstimator

public NumDistinctValueEstimator(String s,
                         int numBitVectors)

Method Detail

reset

public void reset()

Resets a distinctValueEstimator object to its original state.

getBitVector

public javolution.util.FastBitSet getBitVector(int index)

getnumBitVectors

public int getnumBitVectors()

getBitVectorSize

public int getBitVectorSize()

printNumDistinctValueEstimator

public void printNumDistinctValueEstimator()

serialize

public org.apache.hadoop.io.Text serialize()

addToEstimator

public void addToEstimator(long v)

addToEstimatorPCSA

public void addToEstimatorPCSA(long v)

addToEstimator

public void addToEstimator(double d)

addToEstimatorPCSA

public void addToEstimatorPCSA(double d)

addToEstimator

public void addToEstimator(HiveDecimal decimal)

addToEstimatorPCSA

public void addToEstimatorPCSA(HiveDecimal decimal)

mergeEstimators

public void mergeEstimators(NumDistinctValueEstimator o)

estimateNumDistinctValuesPCSA

public long estimateNumDistinctValuesPCSA()

estimateNumDistinctValues

public long estimateNumDistinctValues()