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/*
* 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;
import org.apache.lucene.index.LeafReaderContext;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import java.io.IOException;
import java.util.Map;
/**
* An aggregator that is not collected, this can typically be used when running an aggregation over a field that doesn't have
* a mapping.
*/
public abstract class NonCollectingAggregator extends AggregatorBase {
/**
* Build a {@linkplain NonCollectingAggregator} for any aggregator.
*/
protected NonCollectingAggregator(
String name,
AggregationContext context,
Aggregator parent,
AggregatorFactories subFactories,
Map metadata
) throws IOException {
super(name, subFactories, context, parent, CardinalityUpperBound.NONE, metadata);
}
@Override
public final LeafBucketCollector getLeafCollector(LeafReaderContext reader, LeafBucketCollector sub) {
// the framework will automatically eliminate it
return LeafBucketCollector.NO_OP_COLLECTOR;
}
@Override
public InternalAggregation[] buildAggregations(long[] owningBucketOrds) throws IOException {
InternalAggregation[] results = new InternalAggregation[owningBucketOrds.length];
for (int ordIdx = 0; ordIdx < owningBucketOrds.length; ordIdx++) {
results[ordIdx] = buildEmptyAggregation();
}
return results;
}
}