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/*
* 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.fetch.subphase;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.LegacyIntField;
import org.apache.lucene.document.StringField;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.ConstantScoreQuery;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TotalHitCountCollector;
import org.apache.lucene.search.Weight;
import org.apache.lucene.search.join.BitSetProducer;
import org.apache.lucene.search.join.QueryBitSetProducer;
import org.apache.lucene.store.Directory;
import org.elasticsearch.search.fetch.FetchSubPhase;
import org.elasticsearch.search.fetch.subphase.InnerHitsContext.NestedInnerHits.NestedChildrenQuery;
import org.elasticsearch.test.ESTestCase;
import java.util.ArrayList;
import java.util.List;
import static org.hamcrest.Matchers.equalTo;
/**
*/
public class NestedChildrenFilterTests extends ESTestCase {
public void testNestedChildrenFilter() throws Exception {
int numParentDocs = scaledRandomIntBetween(0, 32);
int maxChildDocsPerParent = scaledRandomIntBetween(8, 16);
Directory dir = newDirectory();
RandomIndexWriter writer = new RandomIndexWriter(random(), dir);
for (int i = 0; i < numParentDocs; i++) {
int numChildDocs = scaledRandomIntBetween(0, maxChildDocsPerParent);
List<Document> docs = new ArrayList<>(numChildDocs + 1);
for (int j = 0; j < numChildDocs; j++) {
Document childDoc = new Document();
childDoc.add(new StringField("type", "child", Field.Store.NO));
docs.add(childDoc);
}
Document parenDoc = new Document();
parenDoc.add(new StringField("type", "parent", Field.Store.NO));
parenDoc.add(new LegacyIntField("num_child_docs", numChildDocs, Field.Store.YES));
docs.add(parenDoc);
writer.addDocuments(docs);
}
IndexReader reader = writer.getReader();
writer.close();
IndexSearcher searcher = new IndexSearcher(reader);
FetchSubPhase.HitContext hitContext = new FetchSubPhase.HitContext();
BitSetProducer parentFilter = new QueryBitSetProducer(new TermQuery(new Term("type", "parent")));
Query childFilter = new TermQuery(new Term("type", "child"));
int checkedParents = 0;
final Weight parentsWeight = searcher.createNormalizedWeight(new TermQuery(new Term("type", "parent")), false);
for (LeafReaderContext leaf : reader.leaves()) {
DocIdSetIterator parents = parentsWeight.scorer(leaf).iterator();
for (int parentDoc = parents.nextDoc(); parentDoc != DocIdSetIterator.NO_MORE_DOCS ; parentDoc = parents.nextDoc()) {
int expectedChildDocs = leaf.reader().document(parentDoc).getField("num_child_docs").numericValue().intValue();
hitContext.reset(null, leaf, parentDoc, searcher);
NestedChildrenQuery nestedChildrenFilter = new NestedChildrenQuery(parentFilter, childFilter, hitContext);
TotalHitCountCollector totalHitCountCollector = new TotalHitCountCollector();
searcher.search(new ConstantScoreQuery(nestedChildrenFilter), totalHitCountCollector);
assertThat(totalHitCountCollector.getTotalHits(), equalTo(expectedChildDocs));
checkedParents++;
}
}
assertThat(checkedParents, equalTo(numParentDocs));
reader.close();
dir.close();
}
}
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