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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.dispatch;
import com.yahoo.prelude.fastsearch.DocsumDefinitionSet;
import com.yahoo.prelude.fastsearch.GroupingListHit;
import com.yahoo.search.Query;
import com.yahoo.searchlib.aggregation.Grouping;
import com.yahoo.searchlib.aggregation.Hit;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Incrementally merges underlying {@link Grouping} instances from {@link GroupingListHit} hits.
*
* @author bjorncs
*/
class GroupingResultAggregator {
private static final Logger log = Logger.getLogger(GroupingResultAggregator.class.getName());
private final Map<Integer, Grouping> groupings = new LinkedHashMap<>();
private DocsumDefinitionSet docsumDefinitions = null;
private Query query = null;
private int groupingHitsMerged = 0;
void mergeWith(GroupingListHit result) {
++groupingHitsMerged;
if (docsumDefinitions == null) docsumDefinitions = result.getDocsumDefinitionSet();
if (query == null) query = result.getQuery();
log.log(Level.FINE, () ->
String.format("Merging hit #%d having %d groupings",
groupingHitsMerged, result.getGroupingList().size()));
for (Grouping grouping : result.getGroupingList()) {
groupings.merge(grouping.getId(), grouping, (existingGrouping, newGrouping) -> {
existingGrouping.merge(newGrouping);
return existingGrouping;
});
}
}
Optional<GroupingListHit> toAggregatedHit() {
if (groupingHitsMerged == 0) return Optional.empty();
log.log(Level.FINE, () ->
String.format("Creating aggregated hit containing %d groupings from %d hits with docsums '%s' and %s",
groupings.size(), groupingHitsMerged, docsumDefinitions, query));
GroupingListHit groupingHit = new GroupingListHit(List.copyOf(groupings.values()), docsumDefinitions);
groupingHit.setQuery(query);
groupingHit.getGroupingList().forEach(g -> {
g.select(o -> o instanceof Hit, o -> ((Hit)o).setContext(groupingHit));
g.postMerge();
});
return Optional.of(groupingHit);
}
}
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