Module org.elasticsearch.server

Package org.elasticsearch.search.aggregations

Class CardinalityUpperBound

java.lang.Object

org.elasticsearch.search.aggregations.CardinalityUpperBound

public abstract class CardinalityUpperBound
extends Object

Upper bound of how many owningBucketOrds that an Aggregator will have to collect into.

Field Summary

Fields

Modifier and Type	Field	Description
static final CardinalityUpperBound	MANY	Aggregators with this cardinality may be collected many times.
static final CardinalityUpperBound	NONE	Aggregators with this cardinality won't collect any data at all.
static final CardinalityUpperBound	ONE	Aggregators with this cardinality will collect be collected once or zero times.

Method Summary

Modifier and Type	Method	Description
abstract <R> R	map(IntFunction<R> mapper)	Map the cardinality to a value.
abstract CardinalityUpperBound	multiply(int bucketCount)	Get the rough measure of the number of buckets a fixed-bucket Aggregator will collect.

Methods inherited from class java.lang.Object

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

Field Details

NONE

public static final CardinalityUpperBound NONE

Aggregators with this cardinality won't collect any data at all. For the most part this happens when an aggregation is inside of a BucketsAggregator that is pointing to an unmapped field.

ONE

public static final CardinalityUpperBound ONE

Aggregators with this cardinality will collect be collected once or zero times. This will only be true for top level Aggregators and for sub-aggregator's who's ancestors are all single-bucket aggregations like FilterAggregator or a RangeAggregator configured to collect only a single range.

MANY

public static final CardinalityUpperBound MANY

Aggregators with this cardinality may be collected many times. Most sub-aggregators of BucketsAggregators will have this cardinality.

Method Details

multiply

public abstract CardinalityUpperBound multiply(int bucketCount)

Get the rough measure of the number of buckets a fixed-bucket Aggregator will collect.

Parameters:

bucketCount - the number of buckets that this Aggregator will collect per owning ordinal

map

public abstract <R> R map(IntFunction<R> mapper)

Map the cardinality to a value. The argument to the mapper is the estimated cardinality, or Integer.MAX_VALUE if the cardinality is unknown.