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 = DirectoryReader.open(directory);
    try {
      assertEquals(1, indexReader.numDocs());
      final IndexSearcher indexSearcher = newSearcher(indexReader);
      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);

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        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 ){

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      @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]);

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    }


    @Override
    protected boolean traverseOrQualifier(EOOrQualifier q) {
      NSArray<Query> queries = queriesForCurrent(q.qualifiers().count());
      DisjunctionMaxQuery query = new DisjunctionMaxQuery(queries, 0);
      _queries.addObject(query);
      return true;
    }

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        ar.add(termQueryConstructor.doConstructQuery(json));
      }


      float tieBreakerMultiplier = (float) jsonQuery.optDouble(TIE_BREAKER_PARAM, .0);
      float boost = (float) jsonQuery.optDouble(BOOST_PARAM, 1.0);
      Query dmq = new DisjunctionMaxQuery(ar, tieBreakerMultiplier);
      dmq.setBoost(boost);


    return dmq;
  }

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          return query;
        }


        if (use_dis_max)
        {
          Query query = new DisjunctionMaxQuery(queries, tie_breaker);
          query.setBoost((float)jsonQuery.optDouble(BOOST_PARAM, 1.0));
          return query;
        }
        else
        {
          BooleanQuery query = new BooleanQuery();
          if (AND_PARAM.equals(default_operator))
          {
            for (Query q : queries)
            {
              query.add(q, BooleanClause.Occur.MUST);
            }
          }
          else
          {
            for (Query q : queries)
            {
              query.add(q, BooleanClause.Occur.SHOULD);
            }
          }
          query.setBoost((float)jsonQuery.optDouble(BOOST_PARAM, 1.0));
          return query;
        }
      }


      synchronized(_qparser)
      {
        Query query = _qparser.parse(queryText);
        query.setBoost((float)jsonQuery.optDouble(BOOST_PARAM, 1.0));
        return query;
      }
    }
    catch (ParseException e) {
      throw new JSONException(e);

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

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            }
            if (queries.size() == 1) {
                return queries.get(0);
            }
            if (groupDismax) {
                return new DisjunctionMaxQuery(queries, tieBreaker);
            } else {
                final BooleanQuery booleanQuery = new BooleanQuery();
                for (Query query : queries) {
                    booleanQuery.add(query, BooleanClause.Occur.SHOULD);
                }

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        if (queries.isEmpty()) {
            return null;
        }


        DisjunctionMaxQuery query = new DisjunctionMaxQuery(queries, tieBreaker);
        query.setBoost(boost);
        if (queryName != null) {
            parseContext.addNamedQuery(queryName, query);
        }
        return query;
    }

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        if (fields != null) {
            if (fields.size() == 1) {
                return getFieldQuerySingle(fields.iterator().next(), queryText, quoted);
            }
            if (settings.useDisMax()) {
                DisjunctionMaxQuery disMaxQuery = new DisjunctionMaxQuery(settings.tieBreaker());
                boolean added = false;
                for (String mField : fields) {
                    Query q = getFieldQuerySingle(mField, queryText, quoted);
                    if (q != null) {
                        added = true;
                        applyBoost(mField, q);
                        disMaxQuery.add(q);
                    }
                }
                if (!added) {
                    return null;
                }

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