Lucene: Question of score caculation with PrefixQuery
- by Keven
Hi,
I meet some problem with the score caculation with a PrefixQuery. To change score of each document, when add document into index, I have used setBoost to change the boost of the document. Then I create PrefixQuery to search, but the result have not been changed according to the boost. It seems setBoost totally doesn't work for a PrefixQuery. Please check my code below:
@Test
public void testNormsDocBoost() throws Exception {
Directory dir = new RAMDirectory();
IndexWriter writer = new IndexWriter(dir, new StandardAnalyzer(Version.LUCENE_CURRENT), true,
IndexWriter.MaxFieldLength.LIMITED);
Document doc1 = new Document();
Field f1 = new Field("contents", "common1", Field.Store.YES, Field.Index.ANALYZED);
doc1.add(f1);
doc1.setBoost(100);
writer.addDocument(doc1);
Document doc2 = new Document();
Field f2 = new Field("contents", "common2", Field.Store.YES, Field.Index.ANALYZED);
doc2.add(f2);
doc2.setBoost(200);
writer.addDocument(doc2);
Document doc3 = new Document();
Field f3 = new Field("contents", "common3", Field.Store.YES, Field.Index.ANALYZED);
doc3.add(f3);
doc3.setBoost(300);
writer.addDocument(doc3);
writer.close();
IndexReader reader = IndexReader.open(dir);
IndexSearcher searcher = new IndexSearcher(reader);
TopDocs docs = searcher.search(new PrefixQuery(new Term("contents", "common")), 10);
for (ScoreDoc doc : docs.scoreDocs) {
System.out.println("docid : " + doc.doc + " score : " + doc.score + " "
+ searcher.doc(doc.doc).get("contents"));
}
}
The output is :
docid : 0 score : 1.0 common1
docid : 1 score : 1.0 common2
docid : 2 score : 1.0 common3
