Package com.yahoo.searchlib.aggregation

Class ExpressionCountAggregationResult

java.lang.Object

com.yahoo.vespa.objects.Selectable

com.yahoo.vespa.objects.Identifiable

com.yahoo.searchlib.expression.ExpressionNode

com.yahoo.searchlib.aggregation.AggregationResult

com.yahoo.searchlib.aggregation.ExpressionCountAggregationResult

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable

public class ExpressionCountAggregationResult
extends AggregationResult

This is an aggregated result holding the number of unique documents matching a given expression.

Author:

bjorncs

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static int	classId

Constructor Summary

Constructors

Constructor	Description
ExpressionCountAggregationResult()	Constructor used for deserialization.
ExpressionCountAggregationResult(Sketch<?> initialSketch, UniqueCountEstimator<Sketch<?>> estimator)	Constructs an instance with a given sketch, sketch merger and unique count estimator.

Method Summary

Modifier and Type	Method	Description
protected boolean	equalsAggregation(AggregationResult obj)
long	getEstimatedUniqueCount()
ResultNode	getRank()	Returns a value that can be used for ranking.
Sketch<?>	getSketch()
int	hashCode()
protected void	onDeserialize(com.yahoo.vespa.objects.Deserializer buf)
protected int	onGetClassId()
protected void	onMerge(AggregationResult result)	Mmust be implemented by subclasses to support merge.
protected void	onSerialize(com.yahoo.vespa.objects.Serializer buf)
void	visitMembers(com.yahoo.vespa.objects.ObjectVisitor visitor)

Methods inherited from class com.yahoo.searchlib.aggregation.AggregationResult

clone, equalsExpression, getExpression, getResult, getTag, merge, onExecute, onPrepare, postMerge, setExpression, setTag

Methods inherited from class com.yahoo.searchlib.expression.ExpressionNode

equals, execute, executeIterative, onArgument, prepare

Methods inherited from class com.yahoo.vespa.objects.Identifiable

create, createFromId, deserialize, deserializeOptional, deserializeWithId, equals, getClassId, getUtf8, putUtf8, registerClass, serialize, serializeOptional, serializeWithId, toString

Methods inherited from class com.yahoo.vespa.objects.Selectable

select, select, selectMembers

Methods inherited from class java.lang.Object

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

Field Detail

classId

public static final int classId

Constructor Detail

ExpressionCountAggregationResult

public ExpressionCountAggregationResult()

Constructor used for deserialization. Will be instantiated with a default sketch.

ExpressionCountAggregationResult

public ExpressionCountAggregationResult(Sketch<?> initialSketch,
                                        UniqueCountEstimator<Sketch<?>> estimator)

Constructs an instance with a given sketch, sketch merger and unique count estimator. For test purposes.

Parameters:

initialSketch - The HLL sketch.

Method Detail

getEstimatedUniqueCount

public long getEstimatedUniqueCount()

Returns:

The unique count estimated by the HyperLogLog algorithm.

getRank

public ResultNode getRank()

Description copied from class: AggregationResult

Returns a value that can be used for ranking.

Specified by:

getRank in class AggregationResult

onMerge

protected void onMerge(AggregationResult result)

Description copied from class: AggregationResult

Mmust be implemented by subclasses to support merge. It is called as the AggregationResult.merge(AggregationResult) method is invoked.

Specified by:

onMerge in class AggregationResult

Parameters:

result - the result to merge with

getSketch

public Sketch<?> getSketch()

onGetClassId

protected int onGetClassId()

Overrides:

onGetClassId in class AggregationResult

onSerialize

protected void onSerialize(com.yahoo.vespa.objects.Serializer buf)

Overrides:

onSerialize in class AggregationResult

onDeserialize

protected void onDeserialize(com.yahoo.vespa.objects.Deserializer buf)

Overrides:

onDeserialize in class AggregationResult

equalsAggregation

protected boolean equalsAggregation(AggregationResult obj)

Specified by:

equalsAggregation in class AggregationResult

visitMembers

public void visitMembers(com.yahoo.vespa.objects.ObjectVisitor visitor)

Overrides:

visitMembers in class AggregationResult

hashCode

public int hashCode()

Overrides:

hashCode in class com.yahoo.vespa.objects.Identifiable