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Elasticsearch subproject :server
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.search.slice;
import com.carrotsearch.hppc.BitMixer;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.DocValues;
import org.apache.lucene.index.SortedNumericDocValues;
import org.apache.lucene.search.ConstantScoreScorer;
import org.apache.lucene.search.ConstantScoreWeight;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Scorer;
import org.apache.lucene.search.TwoPhaseIterator;
import org.apache.lucene.search.Weight;
import java.io.IOException;
/**
* A {@link SliceQuery} that uses the numeric doc values of a field to do the slicing.
*
* NOTE: With deterministic field values this query can be used across different readers safely.
* If updates are accepted on the field you must ensure that the same reader is used for all `slice` queries.
*/
public final class DocValuesSliceQuery extends SliceQuery {
public DocValuesSliceQuery(String field, int id, int max) {
super(field, id, max);
}
@Override
public Weight createWeight(IndexSearcher searcher, boolean needsScores, float boost) throws IOException {
return new ConstantScoreWeight(this, boost) {
@Override
public Scorer scorer(LeafReaderContext context) throws IOException {
final SortedNumericDocValues values = DocValues.getSortedNumeric(context.reader(), getField());
final DocIdSetIterator approximation = DocIdSetIterator.all(context.reader().maxDoc());
final TwoPhaseIterator twoPhase = new TwoPhaseIterator(approximation) {
@Override
public boolean matches() throws IOException {
if (values.advanceExact(approximation.docID())) {
for (int i = 0; i < values.docValueCount(); i++) {
if (contains(BitMixer.mix(values.nextValue()))) {
return true;
}
}
return false;
} else {
return contains(0);
}
}
@Override
public float matchCost() {
// BitMixer.mix seems to be about 10 ops
return 10;
}
};
return new ConstantScoreScorer(this, score(), twoPhase);
}
@Override
public boolean isCacheable(LeafReaderContext ctx) {
return DocValues.isCacheable(ctx, getField());
}
};
}
}