org.elasticsearch.search.aggregations.bucket.composite.TermsSortedDocsProducer 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.composite;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.PostingsEnum;
import org.apache.lucene.index.Terms;
import org.apache.lucene.index.TermsEnum;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.Query;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.DocIdSetBuilder;
import java.io.IOException;
/**
* A {@link SortedDocsProducer} that can sort documents based on terms indexed in the provided field.
*/
class TermsSortedDocsProducer extends SortedDocsProducer {
TermsSortedDocsProducer(String field) {
super(field);
}
@Override
DocIdSet processLeaf(Query query, CompositeValuesCollectorQueue queue, LeafReaderContext context, boolean fillDocIdSet)
throws IOException {
final Terms terms = context.reader().terms(field);
if (terms == null) {
// no value for the field
return DocIdSet.EMPTY;
}
BytesRef lowerValue = (BytesRef) queue.getLowerValueLeadSource();
BytesRef upperValue = (BytesRef) queue.getUpperValueLeadSource();
final TermsEnum te = terms.iterator();
if (lowerValue != null) {
if (te.seekCeil(lowerValue) == TermsEnum.SeekStatus.END) {
return DocIdSet.EMPTY;
}
} else {
if (te.next() == null) {
return DocIdSet.EMPTY;
}
}
DocIdSetBuilder builder = fillDocIdSet ? new DocIdSetBuilder(context.reader().maxDoc(), terms) : null;
PostingsEnum reuse = null;
boolean first = true;
final BytesRef upper = upperValue == null ? null : BytesRef.deepCopyOf(upperValue);
do {
if (upper != null && upper.compareTo(te.term()) < 0) {
break;
}
reuse = te.postings(reuse, PostingsEnum.NONE);
if (processBucket(queue, context, reuse, te.term(), builder) && first == false) {
// this bucket does not have any competitive composite buckets,
// we can early terminate the collection because the remaining buckets are guaranteed
// to be greater than this bucket.
break;
}
first = false;
} while (te.next() != null);
return fillDocIdSet ? builder.build() : DocIdSet.EMPTY;
}
}