Examples of org.apache.lucene.search.join.ToParentBlockJoinQuery$BlockJoinWeight

org.apache.lucene.search.join.ToParentBlockJoinQuery
This query requires that you index children and parent docs as a single block, using the {@link IndexWriter#addDocuments IndexWriter.addDocuments()} or {@link IndexWriter#updateDocuments IndexWriter.updateDocuments()} API. In each block, thechild documents must appear first, ending with the parent document. At search time you provide a Filter identifying the parents, however this Filter must provide an {@link FixedBitSet} per sub-reader.
Once the block index is built, use this query to wrap any sub-query matching only child docs and join matches in that child document space up to the parent document space. You can then use this Query as a clause with other queries in the parent document space.

See {@link ToChildBlockJoinQuery} if you need to joinin the reverse order.
The child documents must be orthogonal to the parent documents: the wrapped child query must never return a parent document.
If you'd like to retrieve {@link TopGroups} for theresulting query, use the {@link ToParentBlockJoinCollector}. Note that this is not necessary, ie, if you simply want to collect the parent documents and don't need to see which child documents matched under that parent, then you can use any collector.
NOTE: If the overall query contains parent-only matches, for example you OR a parent-only query with a joined child-only query, then the resulting collected documents will be correct, however the {@link TopGroups} you getfrom {@link ToParentBlockJoinCollector} will not contain everychild for parents that had matched.
See {@link org.apache.lucene.search.join} for anoverview.
@lucene.experimental

    // Define parent document criteria (find a resident in the UK)
    Query parentQuery = new TermQuery(new Term("country", "United Kingdom"));


    // Wrap the child document query to 'join' any matches
    // up to corresponding parent:
    ToParentBlockJoinQuery childJoinQuery = new ToParentBlockJoinQuery(childQuery, parentsFilter, ToParentBlockJoinQuery.ScoreMode.Avg);


    // Combine the parent and nested child queries into a single query for a candidate
    BooleanQuery fullQuery = new BooleanQuery();
    fullQuery.add(new BooleanClause(parentQuery, Occur.MUST));
    fullQuery.add(new BooleanClause(childJoinQuery, Occur.MUST));

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    // Define parent document criteria (find a resident in the UK)
    Query parentQuery = new TermQuery(new Term("country", "United Kingdom"));
      
    // Wrap the child document query to 'join' any matches
    // up to corresponding parent:
    ToParentBlockJoinQuery childJoinQuery = new ToParentBlockJoinQuery(childQuery, parentsFilter, ToParentBlockJoinQuery.ScoreMode.Avg);
      
    assertEquals("no filter - both passed", 2, s.search(childJoinQuery, 10).totalHits);


    assertEquals("dummy filter passes everyone ", 2, s.search(childJoinQuery, parentsFilter, 10).totalHits);
    assertEquals("dummy filter passes everyone ", 2, s.search(childJoinQuery, new QueryWrapperFilter(new TermQuery(new Term("docType", "resume"))), 10).totalHits);

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    final RandomIndexWriter w = new RandomIndexWriter(random, dir);
    IndexReader r = w.getReader();
    w.close();
    IndexSearcher s = newSearcher(r, false);
    
    ToParentBlockJoinQuery q = new ToParentBlockJoinQuery(new MatchAllDocsQuery(), new QueryWrapperFilter(new MatchAllDocsQuery()), ToParentBlockJoinQuery.ScoreMode.Avg);
    s.search(q, 10);
    BooleanQuery bq = new BooleanQuery();
    bq.setBoost(2f); // we boost the BQ
    bq.add(q, BooleanClause.Occur.MUST);
    s.search(bq, 10);

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        agg = ToParentBlockJoinQuery.ScoreMode.Total;
      } else {
        agg = ToParentBlockJoinQuery.ScoreMode.Avg;
      }


      final ToParentBlockJoinQuery childJoinQuery = new ToParentBlockJoinQuery(childQuery, parentsFilter, agg);


      // To run against the block-join index:
      final Query parentJoinQuery;


      // Same query as parentJoinQuery, but to run against

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    // Define parent document criteria (find a resident in the UK)
    Query parentQuery = new TermQuery(new Term("country", "United Kingdom"));


    // Wrap the child document query to 'join' any matches
    // up to corresponding parent:
    ToParentBlockJoinQuery childJobJoinQuery = new ToParentBlockJoinQuery(childJobQuery, parentsFilter, ToParentBlockJoinQuery.ScoreMode.Avg);
    ToParentBlockJoinQuery childQualificationJoinQuery = new ToParentBlockJoinQuery(childQualificationQuery, parentsFilter, ToParentBlockJoinQuery.ScoreMode.Avg);


    // Combine the parent and nested child queries into a single query for a candidate
    BooleanQuery fullQuery = new BooleanQuery();
    fullQuery.add(new BooleanClause(parentQuery, Occur.MUST));
    fullQuery.add(new BooleanClause(childJobJoinQuery, Occur.MUST));

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    IndexSearcher s = newSearcher(r, false);
    Query tq = new TermQuery(new Term("child", "1"));
    final Filter parentsFilter = new CachingWrapperFilter(new RawTermFilter(new Term("parent", "1")),
                                                          CachingWrapperFilter.DeletesMode.IGNORE);


    ToParentBlockJoinQuery q = new ToParentBlockJoinQuery(tq, parentsFilter, ToParentBlockJoinQuery.ScoreMode.Avg);
    Weight weight = s.createNormalizedWeight(q);
    
    IndexReader atomic;
    if (s.getIndexReader().getSequentialSubReaders() == null) {
      atomic = s.getIndexReader();

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    IndexSearcher s = newSearcher(r, false);
    Query tq = new TermQuery(new Term("child", "2"));
    final Filter parentsFilter = new CachingWrapperFilter(new RawTermFilter(new Term("isparent", "yes")),
                                                          CachingWrapperFilter.DeletesMode.IGNORE);


    ToParentBlockJoinQuery q = new ToParentBlockJoinQuery(tq, parentsFilter, ToParentBlockJoinQuery.ScoreMode.Avg);
    Weight weight = s.createNormalizedWeight(q);
    final IndexReader[] subs = s.getIndexReader().getSequentialSubReaders();
    final IndexReader sub;
    if (subs == null) {
      sub = s.getIndexReader();

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                //}
            } else {
                parentFilter = parseContext.bitsetFilter(parentFilter);
            }


            Filter nestedFilter = Queries.wrap(new ToParentBlockJoinQuery(query, parentFilter, ScoreMode.None), parseContext);


            if (cache) {
                nestedFilter = parseContext.cacheFilter(nestedFilter, cacheKey);
            }
            if (filterName != null) {

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                //    parentFilter = mapper.docMapper().typeFilter();
                //}
            } else {
                parentFilter = parseContext.bitsetFilter(parentFilter);
            }
            ToParentBlockJoinQuery joinQuery = new ToParentBlockJoinQuery(query, parentFilter, scoreMode);
            joinQuery.setBoost(boost);
            if (queryName != null) {
                parseContext.addNamedQuery(queryName, joinQuery);
            }
            return joinQuery;
        } finally {

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        }
        Filter parentFilter = new TermFilter(new Term("type", "parent"));
        Filter childFilter = new NotFilter(parentFilter);
        Nested nested = createNested(parentFilter, childFilter);
        BytesRefFieldComparatorSource nestedComparatorSource = new BytesRefFieldComparatorSource(fieldData, missingValue, sortMode, nested);
        ToParentBlockJoinQuery query = new ToParentBlockJoinQuery(new FilteredQuery(new MatchAllDocsQuery(), childFilter), new BitDocIdSetCachingWrapperFilter(parentFilter), ScoreMode.None);
        Sort sort = new Sort(new SortField("text", nestedComparatorSource));
        TopFieldDocs topDocs = searcher.search(query, randomIntBetween(1, numParents), sort);
        assertTrue(topDocs.scoreDocs.length > 0);
        BytesRef previous = null;
        for (int i = 0; i < topDocs.scoreDocs.length; ++i) {

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org.apache.lucene.search.ComplexExplanation

org.apache.lucene.search.DocIdSet

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org.apache.lucene.search.TestBlockJoin

org.elasticsearch.index.fielddata.AbstractStringFieldDataTests

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