Package org.elasticsearch.search.aggregations.bucket.sampler

Class SamplerAggregator

java.lang.Object

org.elasticsearch.search.aggregations.BucketCollector

org.elasticsearch.search.aggregations.Aggregator

org.elasticsearch.search.aggregations.AggregatorBase

org.elasticsearch.search.aggregations.bucket.BucketsAggregator

org.elasticsearch.search.aggregations.bucket.DeferableBucketAggregator

org.elasticsearch.search.aggregations.bucket.sampler.SamplerAggregator

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, org.apache.lucene.search.Collector, Releasable, SingleBucketAggregator

Direct Known Subclasses:

DiversifiedBytesHashSamplerAggregator, DiversifiedMapSamplerAggregator, DiversifiedNumericSamplerAggregator, DiversifiedOrdinalsSamplerAggregator

public class SamplerAggregator
extends DeferableBucketAggregator
implements SingleBucketAggregator

Aggregate on only the top-scoring docs on a shard. TODO currently the diversity feature of this agg offers only 'script' and 'field' as a means of generating a de-dup value. In future it would be nice if users could use any of the "bucket" aggs syntax (geo, date histogram...) as the basis for generating de-dup values. Their syntax for creating bucket values would be preferable to users having to recreate this logic in a 'script' e.g. to turn a datetime in milliseconds into a month key value.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	SamplerAggregator.ExecutionMode

Nested classes/interfaces inherited from class org.elasticsearch.search.aggregations.bucket.BucketsAggregator

BucketsAggregator.BucketBuilderForFixedCount<B>, BucketsAggregator.BucketBuilderForVariable<B>, BucketsAggregator.ResultBuilderForVariable<B>, BucketsAggregator.SingleBucketResultBuilder

Nested classes/interfaces inherited from class org.elasticsearch.search.aggregations.Aggregator

Aggregator.BucketComparator, Aggregator.Parser, Aggregator.SubAggCollectionMode

Field Summary

Fields

Modifier and Type	Field	Description
protected BestDocsDeferringCollector	bdd
static org.elasticsearch.common.ParseField	EXECUTION_HINT_FIELD
static org.elasticsearch.common.ParseField	MAX_DOCS_PER_VALUE_FIELD
static org.elasticsearch.common.ParseField	SHARD_SIZE_FIELD
protected int	shardSize

Fields inherited from class org.elasticsearch.search.aggregations.bucket.BucketsAggregator

docCountProvider

Fields inherited from class org.elasticsearch.search.aggregations.AggregatorBase

collectableSubAggregators, DEFAULT_WEIGHT, name, parent, subAggregators

Fields inherited from class org.elasticsearch.search.aggregations.BucketCollector

NO_OP_COLLECTOR

Method Summary

Modifier and Type	Method	Description
InternalAggregation[]	buildAggregations(long[] owningBucketOrds)	Build the results of this aggregation.
DeferringBucketCollector	buildDeferringCollector()	Build the DeferringBucketCollector.
InternalAggregation	buildEmptyAggregation()	Build an empty aggregation.
protected void	doClose()	Release instance-specific data.
protected LeafBucketCollector	getLeafCollector(org.apache.lucene.index.LeafReaderContext ctx, LeafBucketCollector sub)	Get a LeafBucketCollector for the given ctx, which should delegate to the given collector.
org.apache.lucene.search.ScoreMode	scoreMode()	Most aggregators don't need scores, make sure to extend this method if your aggregator needs them.
protected boolean	shouldDefer(Aggregator aggregator)	This method should be overridden by subclasses that want to defer calculation of a child aggregation until a first pass is complete and a set of buckets has been pruned.

Methods inherited from class org.elasticsearch.search.aggregations.bucket.DeferableBucketAggregator

collectDebugInfo, deferringCollector, doPreCollection, prepareSubAggs

Methods inherited from class org.elasticsearch.search.aggregations.bucket.BucketsAggregator

bucketComparator, bucketDocCount, buildAggregationsForFixedBucketCount, buildAggregationsForSingleBucket, buildAggregationsForVariableBuckets, buildSubAggsForAllBuckets, buildSubAggsForBuckets, buildSubAggsForBuckets, close, collectBucket, collectExistingBucket, descendsFromGlobalAggregator, getDocCounts, grow, incrementBucketDocCount, maxBucketOrd, preGetSubLeafCollectors, resolveSortPath, rewriteBuckets

Methods inherited from class org.elasticsearch.search.aggregations.AggregatorBase

addRequestCircuitBreakerBytes, bigArrays, buildEmptySubAggregations, doPostCollection, getLeafCollector, metadata, name, parent, pointReaderIfAvailable, postCollection, preCollection, searcher, subAggregator, subAggregators, topLevelQuery, toString

Methods inherited from class org.elasticsearch.search.aggregations.Aggregator

buildTopLevel, resolveSortPathOnValidAgg

Methods inherited from class java.lang.Object

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

Field Details

SHARD_SIZE_FIELD

public static final org.elasticsearch.common.ParseField SHARD_SIZE_FIELD

MAX_DOCS_PER_VALUE_FIELD

public static final org.elasticsearch.common.ParseField MAX_DOCS_PER_VALUE_FIELD

EXECUTION_HINT_FIELD

public static final org.elasticsearch.common.ParseField EXECUTION_HINT_FIELD

shardSize

protected final int shardSize

bdd

protected BestDocsDeferringCollector bdd

Method Details

scoreMode

public org.apache.lucene.search.ScoreMode scoreMode()

Description copied from class: AggregatorBase

Most aggregators don't need scores, make sure to extend this method if your aggregator needs them.

Specified by:

scoreMode in interface org.apache.lucene.search.Collector

Overrides:

scoreMode in class AggregatorBase

buildDeferringCollector

public DeferringBucketCollector buildDeferringCollector()

Description copied from class: DeferableBucketAggregator

Build the DeferringBucketCollector. The default implementation replays all hits against the buckets selected by {#link DeferringBucketCollector.prepareSelectedBuckets(long...).

Overrides:

buildDeferringCollector in class DeferableBucketAggregator

shouldDefer

protected boolean shouldDefer(Aggregator aggregator)

Description copied from class: DeferableBucketAggregator

This method should be overridden by subclasses that want to defer calculation of a child aggregation until a first pass is complete and a set of buckets has been pruned.

Overrides:

shouldDefer in class DeferableBucketAggregator

Parameters:

aggregator - the child aggregator

Returns:

true if the aggregator should be deferred until a first pass at collection has completed

buildAggregations

public InternalAggregation[] buildAggregations(long[] owningBucketOrds)
                                        throws java.io.IOException

Description copied from class: Aggregator

Build the results of this aggregation.

Specified by:

buildAggregations in class Aggregator

Parameters:

owningBucketOrds - the ordinals of the buckets that we want to collect from this aggregation

Returns:

the results for each ordinal, in the same order as the array of ordinals

Throws:

java.io.IOException

buildEmptyAggregation

public InternalAggregation buildEmptyAggregation()

Description copied from class: Aggregator

Build an empty aggregation.

Specified by:

buildEmptyAggregation in class Aggregator

getLeafCollector

protected LeafBucketCollector getLeafCollector(org.apache.lucene.index.LeafReaderContext ctx,
LeafBucketCollector sub)
                                        throws java.io.IOException

Description copied from class: AggregatorBase

Get a LeafBucketCollector for the given ctx, which should delegate to the given collector.

Specified by:

getLeafCollector in class AggregatorBase

Throws:

java.io.IOException

doClose

protected void doClose()

Description copied from class: AggregatorBase

Release instance-specific data.

Overrides:

doClose in class AggregatorBase