Examples of org.apache.lucene.search.DisjunctionMaxQuery

org.apache.lucene.search.DisjunctionMaxQuery
A query that generates the union of documents produced by its subqueries, and that scores each document with the maximum score for that document as produced by any subquery, plus a tie breaking increment for any additional matching subqueries. This is useful when searching for a word in multiple fields with different boost factors (so that the fields cannot be combined equivalently into a single search field). We want the primary score to be the one associated with the highest boost, not the sum of the field scores (as BooleanQuery would give). If the query is "albino elephant" this ensures that "albino" matching one field and "elephant" matching another gets a higher score than "albino" matching both fields. To get this result, use both BooleanQuery and DisjunctionMaxQuery: for each term a DisjunctionMaxQuery searches for it in each field, while the set of these DisjunctionMaxQuery's is combined into a BooleanQuery. The tie breaker capability allows results that include the same term in multiple fields to be judged better than results that include this term in only the best of those multiple fields, without confusing this with the better case of two different terms in the multiple fields.

    final IndexReader indexReader = IndexReader.open(directory, true);
    try {
      assertEquals(1, indexReader.numDocs());
      final IndexSearcher indexSearcher = newSearcher(indexReader);
      try {
        final DisjunctionMaxQuery query = new DisjunctionMaxQuery(1);
        query.add(new SpanTermQuery(new Term(FIELD, "{fox}")));
        query.add(new SpanTermQuery(new Term(FIELD, "fox")));
        // final Query phraseQuery = new SpanNearQuery(new SpanQuery[] {
        // new SpanTermQuery(new Term(FIELD, "{fox}")),
        // new SpanTermQuery(new Term(FIELD, "fox")) }, 0, true);


        TopDocs hits = indexSearcher.search(query, 1);

View Full Code Here

    final IndexReader indexReader = IndexReader.open(directory, true);
    try {
      assertEquals(1, indexReader.numDocs());
      final IndexSearcher indexSearcher = newSearcher(indexReader);
      try {
        final DisjunctionMaxQuery query = new DisjunctionMaxQuery(1);
        query.add(new SpanTermQuery(new Term(FIELD, "{fox}")));
        query.add(new SpanTermQuery(new Term(FIELD, "fox")));
        // final Query phraseQuery = new SpanNearQuery(new SpanQuery[] {
        // new SpanTermQuery(new Term(FIELD, "{fox}")),
        // new SpanTermQuery(new Term(FIELD, "fox")) }, 0, true);


        TopDocs hits = indexSearcher.search(query, 1);

View Full Code Here

  protected Query dmq( Query... queries ){
    return dmq( 0.0F, queries );
  }
  
  protected Query dmq( float tieBreakerMultiplier, Query... queries ){
    DisjunctionMaxQuery query = new DisjunctionMaxQuery( tieBreakerMultiplier );
    for( Query q : queries ){
      query.add( q );
    }
    return query;
  }

View Full Code Here

        if( !clause.isProhibited() ) {
          flatten( applyParentBoost( clause.getQuery(), bq ), reader, flatQueries );
        }
      }
    } else if( sourceQuery instanceof DisjunctionMaxQuery ){
      DisjunctionMaxQuery dmq = (DisjunctionMaxQuery)sourceQuery;
      for( Query query : dmq ){
        flatten( applyParentBoost( query, dmq ), reader, flatQueries );
      }
    }
    else if( sourceQuery instanceof TermQuery ){

View Full Code Here

  protected Query dmq( Query... queries ){
    return dmq( 0.0F, queries );
  }
  
  protected Query dmq( float tieBreakerMultiplier, Query... queries ){
    DisjunctionMaxQuery query = new DisjunctionMaxQuery( tieBreakerMultiplier );
    for( Query q : queries ){
      query.add( q );
    }
    return query;
  }

View Full Code Here

  }
  
  public void testDisjunctionMaxQueryXML() throws ParserException, IOException {
    Query q = parse("DisjunctionMaxQuery.xml");
    assertTrue(q instanceof DisjunctionMaxQuery);
    DisjunctionMaxQuery d = (DisjunctionMaxQuery)q;
    assertEquals(0.0f, d.getTieBreakerMultiplier(), 0.0001f);
    assertEquals(2, d.getDisjuncts().size());
    DisjunctionMaxQuery ndq = (DisjunctionMaxQuery) d.getDisjuncts().get(1);
    assertEquals(1.2f, ndq.getTieBreakerMultiplier(), 0.0001f);
    assertEquals(1, ndq.getDisjuncts().size());
  }

View Full Code Here

  }
  
  public void testDisjunctionMaxQueryXML() throws ParserException, IOException {
    Query q = parse("DisjunctionMaxQuery.xml");
    assertTrue(q instanceof DisjunctionMaxQuery);
    DisjunctionMaxQuery d = (DisjunctionMaxQuery)q;
    assertEquals(0.0f, d.getTieBreakerMultiplier(), 0.0001f);
    assertEquals(2, d.getDisjuncts().size());
    DisjunctionMaxQuery ndq = (DisjunctionMaxQuery) d.getDisjuncts().get(1);
    assertEquals(1.2f, ndq.getTieBreakerMultiplier(), 0.0001f);
    assertEquals(1, ndq.getDisjuncts().size());
  }

View Full Code Here

      @Override
      protected Analyzer getIndexAnalyzer(String field) {
        return analyzer;
      }
    };
    DisjunctionMaxQuery query = new DisjunctionMaxQuery(0);
    query.add(new WildcardQuery(new Term("body", "te*")));
    TopDocs topDocs = searcher.search(query, null, 10, Sort.INDEXORDER);
    assertEquals(2, topDocs.totalHits);
    String snippets[] = highlighter.highlight("body", query, searcher, topDocs);
    assertEquals(2, snippets.length);
    assertEquals("This is a <b>test</b>.", snippets[0]);

View Full Code Here

        // convert the query to lower-case
        String queryString = label.toLowerCase();


        AllDocCollector collector = new AllDocCollector();


        DisjunctionMaxQuery query = new DisjunctionMaxQuery(0.0f);
        query.add(new TermQuery(new Term(FIELD_PREF_LABEL, queryString)));
        query.add(new TermQuery(new Term(FIELD_ALT_LABEL, queryString)));
        query.add(new TermQuery(new Term(FIELD_HIDDEN_LABEL, queryString)));
        searcher.search(query, collector);


        for (Integer hit : collector.getDocs()) {
            Document doc = searcher.doc(hit);
            String conceptURI = doc.getValues(FIELD_URI)[0];

View Full Code Here

                    tieBreaker = parser.floatValue();
                }
            }
        }


        DisjunctionMaxQuery query = new DisjunctionMaxQuery(queries, tieBreaker);
        query.setBoost(boost);
        return query;
    }

View Full Code Here

0 1 2 3 4 5 6

TOP

Related Classes of org.apache.lucene.search.DisjunctionMaxQuery

com.senseidb.search.query.DistMaxQueryConstructor

com.senseidb.search.query.QueryStringQueryConstructor

er.luceneadaptor.ERLuceneAdaptorChannel$LuceneQualifierTraversal

io.crate.lucene.match.MultiMatchQueryBuilder$GroupQueryBuilder

org.apache.lucene.queryparser.classic.MapperQueryParser

org.apache.lucene.queryParser.MultiFieldMapperQueryParser

org.apache.lucene.queryparser.xml.builders.DisjunctionMaxQueryBuilder

org.apache.lucene.queryparser.xml.TestParser

org.apache.lucene.search.highlight.TokenSourcesTest

org.apache.lucene.search.postingshighlight.TestMultiTermHighlighting

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.