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.

    @Override
    protected Query getFieldQuery(String field, String queryText, int slop) throws ParseException {
        Collection<String> fields = extractMultiFields(field);
        if (fields != null) {
            if (settings.useDisMax()) {
                DisjunctionMaxQuery disMaxQuery = new DisjunctionMaxQuery(settings.tieBreaker());
                boolean added = false;
                for (String mField : fields) {
                    Query q = super.getFieldQuery(mField, queryText, slop);
                    if (q != null) {
                        added = true;
                        applyBoost(mField, q);
                        applySlop(q, slop);
                        disMaxQuery.add(q);
                    }
                }
                if (!added) {
                    return null;
                }

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        if (fields.size() == 1) {
            return getRangeQuerySingle(fields.iterator().next(), part1, part2, startInclusive, endInclusive);
        }


        if (settings.useDisMax()) {
            DisjunctionMaxQuery disMaxQuery = new DisjunctionMaxQuery(settings.tieBreaker());
            boolean added = false;
            for (String mField : fields) {
                Query q = getRangeQuerySingle(mField, part1, part2, startInclusive, endInclusive);
                if (q != null) {
                    added = true;
                    applyBoost(mField, q);
                    disMaxQuery.add(q);
                }
            }
            if (!added) {
                return null;
            }

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

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

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

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

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    @Test
    public void testQueryStringFields2Builder() throws Exception {
        IndexQueryParserService queryParser = queryParser();
        Query parsedQuery = queryParser.parse(queryString("test").field("content").field("name").useDisMax(true)).query();
        assertThat(parsedQuery, instanceOf(DisjunctionMaxQuery.class));
        DisjunctionMaxQuery disMaxQuery = (DisjunctionMaxQuery) parsedQuery;
        List<Query> disjuncts = disMaxQuery.getDisjuncts();
        assertThat(((TermQuery) disjuncts.get(0)).getTerm(), equalTo(new Term("content", "test")));
        assertThat(((TermQuery) disjuncts.get(1)).getTerm(), equalTo(new Term("name", "test")));
    }

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    public void testQueryStringFields2() throws Exception {
        IndexQueryParserService queryParser = queryParser();
        String query = copyToStringFromClasspath("/org/elasticsearch/index/query/query-fields2.json");
        Query parsedQuery = queryParser.parse(query).query();
        assertThat(parsedQuery, instanceOf(DisjunctionMaxQuery.class));
        DisjunctionMaxQuery disMaxQuery = (DisjunctionMaxQuery) parsedQuery;
        List<Query> disjuncts = disMaxQuery.getDisjuncts();
        assertThat(((TermQuery) disjuncts.get(0)).getTerm(), equalTo(new Term("content", "test")));
        assertThat(((TermQuery) disjuncts.get(1)).getTerm(), equalTo(new Term("name", "test")));
    }

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    @Test
    public void testQueryStringFields3Builder() throws Exception {
        IndexQueryParserService queryParser = queryParser();
        Query parsedQuery = queryParser.parse(queryString("test").field("content", 2.2f).field("name").useDisMax(true)).query();
        assertThat(parsedQuery, instanceOf(DisjunctionMaxQuery.class));
        DisjunctionMaxQuery disMaxQuery = (DisjunctionMaxQuery) parsedQuery;
        List<Query> disjuncts = disMaxQuery.getDisjuncts();
        assertThat(((TermQuery) disjuncts.get(0)).getTerm(), equalTo(new Term("content", "test")));
        assertThat((double) disjuncts.get(0).getBoost(), closeTo(2.2, 0.01));
        assertThat(((TermQuery) disjuncts.get(1)).getTerm(), equalTo(new Term("name", "test")));
        assertThat((double) disjuncts.get(1).getBoost(), closeTo(1, 0.01));
    }

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    public void testQueryStringFields3() throws Exception {
        IndexQueryParserService queryParser = queryParser();
        String query = copyToStringFromClasspath("/org/elasticsearch/index/query/query-fields3.json");
        Query parsedQuery = queryParser.parse(query).query();
        assertThat(parsedQuery, instanceOf(DisjunctionMaxQuery.class));
        DisjunctionMaxQuery disMaxQuery = (DisjunctionMaxQuery) parsedQuery;
        List<Query> disjuncts = disMaxQuery.getDisjuncts();
        assertThat(((TermQuery) disjuncts.get(0)).getTerm(), equalTo(new Term("content", "test")));
        assertThat((double) disjuncts.get(0).getBoost(), closeTo(2.2, 0.01));
        assertThat(((TermQuery) disjuncts.get(1)).getTerm(), equalTo(new Term("name", "test")));
        assertThat((double) disjuncts.get(1).getBoost(), closeTo(1, 0.01));
    }

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