org.elasticsearch.search.aggregations.bucket.global.GlobalAggregator Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch Show documentation
Show all versions of elasticsearch Show documentation
Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.search.aggregations.bucket.global;
import org.apache.lucene.search.BulkScorer;
import org.apache.lucene.search.LeafCollector;
import org.apache.lucene.search.MatchAllDocsQuery;
import org.apache.lucene.search.Scorable;
import org.apache.lucene.search.Weight;
import org.elasticsearch.search.aggregations.AggregationExecutionContext;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.CardinalityUpperBound;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.LeafBucketCollector;
import org.elasticsearch.search.aggregations.bucket.BucketsAggregator;
import org.elasticsearch.search.aggregations.bucket.SingleBucketAggregator;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import java.io.IOException;
import java.util.Map;
public class GlobalAggregator extends BucketsAggregator implements SingleBucketAggregator {
private final Weight weight;
public GlobalAggregator(String name, AggregatorFactories subFactories, AggregationContext context, Map metadata)
throws IOException {
super(name, subFactories, context, null, CardinalityUpperBound.ONE, metadata);
weight = context.filterQuery(new MatchAllDocsQuery()).createWeight(context.searcher(), scoreMode(), 1.0f);
}
@Override
public LeafBucketCollector getLeafCollector(AggregationExecutionContext aggCtx, LeafBucketCollector sub) throws IOException {
// Run sub-aggregations on child documents
BulkScorer scorer = weight.bulkScorer(aggCtx.getLeafReaderContext());
if (scorer == null) {
return LeafBucketCollector.NO_OP_COLLECTOR;
}
scorer.score(new LeafCollector() {
@Override
public void collect(int doc) throws IOException {
collectBucket(sub, doc, 0);
}
@Override
public void setScorer(Scorable scorer) throws IOException {
sub.setScorer(scorer);
}
}, aggCtx.getLeafReaderContext().reader().getLiveDocs());
return LeafBucketCollector.NO_OP_COLLECTOR;
}
@Override
public InternalAggregation[] buildAggregations(long[] owningBucketOrds) throws IOException {
assert owningBucketOrds.length == 1 && owningBucketOrds[0] == 0 : "global aggregator can only be a top level aggregator";
return buildAggregationsForSingleBucket(
owningBucketOrds,
(owningBucketOrd, subAggregationResults) -> new InternalGlobal(
name,
bucketDocCount(owningBucketOrd),
subAggregationResults,
metadata()
)
);
}
@Override
public InternalAggregation buildEmptyAggregation() {
throw new UnsupportedOperationException(
"global aggregations cannot serve as sub-aggregations, hence should never be called on #buildEmptyAggregations"
);
}
}