What on earth is FilteredQuery.explain doing?

[Trejkaz]

Hi all.

In this test, I wrap a query in a FilteredQuery. Then I do a query
which returns one doc and pass that doc ID to get an explanation.

The resulting Explanation.isMatch() returns false, which seems odd,
considering it was obviously a match.

Is this a bug? Code follows.

TX


public class TestFilteredSearcherWtf
{
    private Directory directory;
    private IndexReader reader;
    private IndexSearcher searcher;
    private Query query = new TermQuery(new Term("value", "1"));
    private Filter filter = not(
        new QueryWrapperFilter(new TermsFilter(new Term("hidden", "1"))));

    @Test
    public void testSearch() throws Exception
    {
        TopDocs topDocs = searcher.search(query, filter, 10);
        int doc = topDocs.scoreDocs[0].doc; // <- got the doc here

        Explanation explanation = searcher.explain(new
FilteredQuery(query, filter), doc);
        assertThat(explanation.isMatch(), is(true)); // <- so it
should return true, right?
    }

    public static Filter not(Filter filter)
    {
        BooleanQuery booleanQuery = new BooleanQuery();
        booleanQuery.add(new MatchAllDocsQuery(), BooleanClause.Occur.SHOULD);
        booleanQuery.add(filter, BooleanClause.Occur.MUST_NOT);
        return new QueryWrapperFilter(booleanQuery);
    }

    @Before
    public void setUp() throws Exception
    {
        directory = new RAMDirectory();

        try (IndexWriter writer = new IndexWriter(directory, new
IndexWriterConfig(new WhitespaceAnalyzer())))
        {
            Document doc1 = new Document();
            doc1.add(new StringField("hidden", "1", Field.Store.YES));
            doc1.add(new StringField("value", "1", Field.Store.YES));
            writer.addDocument(doc1);

            Document doc2 = new Document();
            doc2.add(new StringField("value", "1", Field.Store.YES));
            writer.addDocument(doc2);

            Document doc3 = new Document();
            doc3.add(new StringField("hidden", "1", Field.Store.YES));
            doc3.add(new StringField("value", "2", Field.Store.YES));
            writer.addDocument(doc3);
            Document doc4 = new Document();
            doc4.add(new StringField("value", "2", Field.Store.YES));
            writer.addDocument(doc4);
        }

        reader = DirectoryReader.open(directory);
        searcher = new IndexSearcher(reader);

    }

    @After
    public void tearDown() throws Exception
    {
        if (reader != null)
        {
            reader.close();
        }

        if (directory != null)
        {
            directory.close();
        }
    }
}

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