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

NumDistinctValueEstimator(int numBitVectors)

NumDistinctValueEstimator(String s, int numBitVectors)

Method Summary

void	addToEstimator(long v)
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

equals, 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)

mergeEstimators

public void mergeEstimators(NumDistinctValueEstimator o)

estimateNumDistinctValuesPCSA

public long estimateNumDistinctValuesPCSA()

estimateNumDistinctValues

public long estimateNumDistinctValues()