Examples with NestedChildrenQuery org.elasticsearch.search.fetch.subphase.InnerHitsContext.NestedInnerHits.NestedChildrenQuery used on opensource projects

Example 1 with NestedChildrenQuery

use of org.elasticsearch.search.fetch.subphase.InnerHitsContext.NestedInnerHits.NestedChildrenQuery in project elasticsearch by elastic.

the class NestedChildrenFilterTests method testNestedChildrenFilter.

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();
}