Package io.prestosql.operator

Class HashCollisionsInfo

java.lang.Object

io.prestosql.operator.HashCollisionsInfo

All Implemented Interfaces:

OperatorInfo, Mergeable<HashCollisionsInfo>

public class HashCollisionsInfo
extends Object
implements Mergeable<HashCollisionsInfo>, OperatorInfo

Field Summary

Fields

Modifier and Type	Field	Description
static String	WEIGHTED_EXPECTED_HASH_COLLISIONS
static String	WEIGHTED_HASH_COLLISIONS_PROPERTY
static String	WEIGHTED_SUM_SQUARED_HASH_COLLISIONS

Constructor Summary

Constructors

Constructor	Description
HashCollisionsInfo(double weightedHashCollisions, double weightedSumSquaredHashCollisions, double weightedExpectedHashCollisions)

Method Summary

Modifier and Type	Method	Description
static HashCollisionsInfo	createHashCollisionsInfo(long inputPositionsCount, double hashCollisionsCount, double expectedHashCollisions)
double	getWeightedExpectedHashCollisions()
double	getWeightedHashCollisions()
double	getWeightedSumSquaredHashCollisions()
HashCollisionsInfo	mergeWith(HashCollisionsInfo other)	Merges the current state with the state of the other instance, and returns the merged state.

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.prestosql.operator.OperatorInfo

isFinal

Field Detail

WEIGHTED_HASH_COLLISIONS_PROPERTY

public static final String WEIGHTED_HASH_COLLISIONS_PROPERTY

See Also:

Constant Field Values

WEIGHTED_SUM_SQUARED_HASH_COLLISIONS

public static final String WEIGHTED_SUM_SQUARED_HASH_COLLISIONS

See Also:

Constant Field Values

WEIGHTED_EXPECTED_HASH_COLLISIONS

public static final String WEIGHTED_EXPECTED_HASH_COLLISIONS

See Also:

Constant Field Values

Constructor Detail

HashCollisionsInfo

public HashCollisionsInfo(double weightedHashCollisions,
                          double weightedSumSquaredHashCollisions,
                          double weightedExpectedHashCollisions)

Method Detail

createHashCollisionsInfo

public static HashCollisionsInfo createHashCollisionsInfo(long inputPositionsCount,
                                                          double hashCollisionsCount,
                                                          double expectedHashCollisions)

getWeightedSumSquaredHashCollisions

public double getWeightedSumSquaredHashCollisions()

getWeightedHashCollisions

public double getWeightedHashCollisions()

getWeightedExpectedHashCollisions

public double getWeightedExpectedHashCollisions()

mergeWith

public HashCollisionsInfo mergeWith(HashCollisionsInfo other)

Description copied from interface: Mergeable

Merges the current state with the state of the other instance, and returns the merged state.

Specified by:

mergeWith in interface Mergeable<HashCollisionsInfo>