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This module adds the support parent-child queries and aggregations
/*
* 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.join.aggregations;
import org.apache.lucene.search.Query;
import org.elasticsearch.search.aggregations.AggregationExecutionException;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.CardinalityUpperBound;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.NonCollectingAggregator;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import org.elasticsearch.search.aggregations.support.ValuesSource;
import org.elasticsearch.search.aggregations.support.ValuesSource.Bytes.WithOrdinals;
import org.elasticsearch.search.aggregations.support.ValuesSourceAggregatorFactory;
import org.elasticsearch.search.aggregations.support.ValuesSourceConfig;
import java.io.IOException;
import java.util.Map;
import static org.elasticsearch.search.aggregations.support.AggregationUsageService.OTHER_SUBTYPE;
public class ChildrenAggregatorFactory extends ValuesSourceAggregatorFactory {
private final Query parentFilter;
private final Query childFilter;
public ChildrenAggregatorFactory(
String name,
ValuesSourceConfig config,
Query childFilter,
Query parentFilter,
AggregationContext context,
AggregatorFactory parent,
AggregatorFactories.Builder subFactoriesBuilder,
Map metadata
) throws IOException {
super(name, config, context, parent, subFactoriesBuilder, metadata);
this.childFilter = childFilter;
this.parentFilter = parentFilter;
}
@Override
protected Aggregator createUnmapped(Aggregator parent, Map metadata) throws IOException {
return new NonCollectingAggregator(name, context, parent, factories, metadata) {
@Override
public InternalAggregation buildEmptyAggregation() {
return new InternalChildren(name, 0, buildEmptySubAggregations(), metadata());
}
};
}
@Override
protected Aggregator doCreateInternal(Aggregator parent, CardinalityUpperBound cardinality, Map metadata)
throws IOException {
ValuesSource rawValuesSource = config.getValuesSource();
if (rawValuesSource instanceof WithOrdinals == false) {
throw new AggregationExecutionException(
"ValuesSource type " + rawValuesSource.toString() + "is not supported for aggregation " + this.name()
);
}
WithOrdinals valuesSource = (WithOrdinals) rawValuesSource;
long maxOrd = valuesSource.globalMaxOrd(context.searcher());
return new ParentToChildrenAggregator(
name,
factories,
context,
parent,
childFilter,
parentFilter,
valuesSource,
maxOrd,
cardinality,
metadata
);
}
@Override
public String getStatsSubtype() {
// Child Aggregation is registered in non-standard way, so it might return child's values type
return OTHER_SUBTYPE;
}
}
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