Examples of org.apache.lucene.search.join.BlockJoinQuery$BlockJoinScorer

org.apache.lucene.search.join.BlockJoinQuery
This query requires that you index children and parent docs as a single block, using the {@link IndexWriter#addDocuments} or {@link 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.

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 BlockJoinCollector}. 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 BlockJoinCollector} 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:
    BlockJoinQuery childJoinQuery = new BlockJoinQuery(childQuery, parentsFilter, BlockJoinQuery.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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        final int childFieldID = _TestUtil.nextInt(random, 1, childFields.length-1);
        bq.add(new TermQuery(new Term("child" + childFieldID, childFields[childFieldID][random.nextInt(childFields[childFieldID].length)])),
               random.nextBoolean() ? BooleanClause.Occur.MUST : BooleanClause.Occur.MUST_NOT);
      }


      final BlockJoinQuery childJoinQuery = new BlockJoinQuery(childQuery, parentsFilter, BlockJoinQuery.ScoreMode.Avg);


      // 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:
    BlockJoinQuery childJoinQuery = new BlockJoinQuery(childQuery, parentsFilter, BlockJoinQuery.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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    final RandomIndexWriter w = new RandomIndexWriter(random, dir);
    IndexReader r = w.getReader();
    w.close();
    IndexSearcher s = newSearcher(r);
    
    BlockJoinQuery q = new BlockJoinQuery(new MatchAllDocsQuery(), new QueryWrapperFilter(new MatchAllDocsQuery()), BlockJoinQuery.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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        final int childFieldID = _TestUtil.nextInt(random, 1, childFields.length-1);
        bq.add(new TermQuery(new Term("child" + childFieldID, childFields[childFieldID][random.nextInt(childFields[childFieldID].length)])),
               random.nextBoolean() ? BooleanClause.Occur.MUST : BooleanClause.Occur.MUST_NOT);
      }


      final BlockJoinQuery childJoinQuery = new BlockJoinQuery(childQuery, parentsFilter, BlockJoinQuery.ScoreMode.Avg);


      // 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:
    BlockJoinQuery childJobJoinQuery = new BlockJoinQuery(childJobQuery, parentsFilter, BlockJoinQuery.ScoreMode.Avg);
    BlockJoinQuery childQualificationJoinQuery = new BlockJoinQuery(childQualificationQuery, parentsFilter, BlockJoinQuery.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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Related Classes of org.apache.lucene.search.join.BlockJoinQuery$BlockJoinScorer

org.apache.lucene.search.ComplexExplanation

org.apache.lucene.search.DocIdSet

org.apache.lucene.search.Query

org.apache.lucene.search.Scorer

org.apache.lucene.search.TestBlockJoin

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