[LUCENE-1543] Field specified norms in MatchAllDocumentsScorer

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.4
• Fix Version/s: 2.9
• Component/s: core/query/scoring
• Lucene Fields: New, Patch Available
• Assignee: Michael McCandless
• Reporter: Karl Wettin
• Created: 19/Feb/09 16:24
• Updated: 28/Aug/22 11:57
• Resolved: 19/Mar/09 14:41

Description

This patch allows for optionally setting a field to use for norms factoring when scoring a MatchingAllDocumentsQuery.

From the test case:

.
    RAMDirectory dir = new RAMDirectory();
    IndexWriter iw = new IndexWriter(dir, new StandardAnalyzer(), true, IndexWriter.MaxFieldLength.LIMITED);
    iw.setMaxBufferedDocs(2);  // force multi-segment
    addDoc("one", iw, 1f);
    addDoc("two", iw, 20f);
    addDoc("three four", iw, 300f);
    iw.close();

    IndexReader ir = IndexReader.open(dir);
    IndexSearcher is = new IndexSearcher(ir);
    ScoreDoc[] hits;

    // assert with norms scoring turned off

    hits = is.search(new MatchAllDocsQuery(), null, 1000).scoreDocs;
    assertEquals(3, hits.length);
    assertEquals("one", ir.document(hits[0].doc).get("key"));
    assertEquals("two", ir.document(hits[1].doc).get("key"));
    assertEquals("three four", ir.document(hits[2].doc).get("key"));

    // assert with norms scoring turned on

    MatchAllDocsQuery normsQuery = new MatchAllDocsQuery("key");
    assertEquals(3, hits.length);
//    is.explain(normsQuery, hits[0].doc);
    hits = is.search(normsQuery, null, 1000).scoreDocs;

    assertEquals("three four", ir.document(hits[0].doc).get("key"));    
    assertEquals("two", ir.document(hits[1].doc).get("key"));
    assertEquals("one", ir.document(hits[2].doc).get("key"));