c# - 某些查询的一致 Lucene.NET 运行时异常

Question

我正在使用 Lucene.NET 在我们的应用程序中整合全文搜索的概念证明。有些查询工作正常，有些似乎返回的结果与 Luke 工具返回的结果不匹配。更有问题的是，这个查询:

(Description:tasty) (Gtin:00018389732061)

总是产生这个异常:

An unhandled exception of type 'System.IndexOutOfRangeException' occurred in Lucene.Net.dll at Lucene.Net.Search.TermScorer.Score() in d:\Lucene.Net\FullRepo\trunk\src\core\Search\TermScorer.cs:line 136 at Lucene.Net.Search.BooleanScorer.BooleanScorerCollector.Collect(Int32 doc) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\BooleanScorer.cs:line 88 at Lucene.Net.Search.TermScorer.Score(Collector c, Int32 end, Int32 firstDocID) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\TermScorer.cs:line 80
at Lucene.Net.Search.BooleanScorer.Score(Collector collector, Int32 max, Int32 firstDocID) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\BooleanScorer.cs:line 323 at Lucene.Net.Search.BooleanScorer.Score(Collector collector) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\BooleanScorer.cs:line 389 at Lucene.Net.Search.IndexSearcher.Search(Weight weight, Filter filter, Collector collector) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\IndexSearcher.cs:line 228 at Lucene.Net.Search.IndexSearcher.Search(Weight weight, Filter filter, Int32 nDocs) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\IndexSearcher.cs:line 188 at Lucene.Net.Search.Searcher.Search(Query query, Filter filter, Int32 n) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\Searcher.cs:line 108 at Lucene.Net.Search.Searcher.Search(Query query, Int32 n) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\Searcher.cs:line 118
at...

如果我改为使用此查询:

(Description:tasty) (Gtin:000)

我得到了结果。是什么导致了顶级查询中的异常？ FWIW，这里是相关的代码片段:

protected virtual IList<Document> GetDocuments(BooleanQuery query, DirectoryInfo indexLocation, string defaultField)
        {
            var docs = new List<Document>();

            using (var dir = new MMapDirectory(indexLocation))
            {
                using (var searcher = new IndexSearcher(dir))
                {                        
                    var queryParser = new QueryParser(Constants.LuceneVersion, defaultField, new StandardAnalyzer(Constants.LuceneVersion));
                    TopDocs result = searcher.Search(query, Constants.MaxHits);

                    if (result == null) return docs;

                    foreach (var scoredoc in result.ScoreDocs.OrderByDescending(d => d.Score))
                    {
                        docs.Add(searcher.Doc(scoredoc.Doc));
                    }
                    return docs;
                }
            }
        }

根据下面的评论，这是我当前未编辑的代码，但仍然无法正常工作。

protected virtual IList<Document> GetDocuments(BooleanQuery query, DirectoryInfo indexLocation, string defaultField)
        {
            var docs = new List<Document>();

            using (var dir = new MMapDirectory(indexLocation))
            {
                using (var searcher = new IndexSearcher(dir))
                {
                    using (var analyzer = new StandardAnalyzer(Constants.LuceneVersion))
                    {
                        var queryParser = new QueryParser(Constants.LuceneVersion, defaultField, analyzer);
                        var collector = TopScoreDocCollector.Create(Constants.MaxHits, true);
                        var parsed = queryParser.Parse(query.ToString());
                        searcher.Search(parsed, collector);

                        var docsresult = new List<string>();
                        var matches = collector.TopDocs().ScoreDocs;
                        foreach (var scoredoc in matches.OrderByDescending(d => d.Score))
                        {
                            docs.Add(searcher.Doc(scoredoc.Doc));
                        }
                        return docs;
                    }
                }
            }
        }

Answer 1

严格来说不是一个答案，因为它“在我的机器上工作”。作为答案发布，以便我可以共享“有效”的单元测试代码。希望 OP 可以展示他们的版本有什么不同。

此版本假设“Gtin”字段是一个字符串字段并且未被分析(因为它似乎是一个代码)。

[TestClass]
public class UnitTest4
{
    [TestMethod]
    public void TestLucene()
    {
        var writer = CreateIndex();
        Add(writer, "tasty", "00018389732061");
        writer.Flush(true, true, true);

        var searcher = new IndexSearcher(writer.GetReader());
        Test(searcher, "(Description:tasty) (Gtin:00018389732061)");
        Test(searcher, "Description:tasty Gtin:00018389732061");
        Test(searcher, "+Description:tasty +Gtin:00018389732061");
        Test(searcher, "+Description:tasty +Gtin:000*");

        writer.Dispose();
    }

    private void Test(IndexSearcher searcher, string query)
    {
        var result = Search(searcher, query);
        Console.WriteLine(string.Join(", ", result));
        Assert.AreEqual(1, result.Count);
        Assert.AreEqual("00018389732061", result[0]);
    }

    private List<string> Search(IndexSearcher searcher, string expr)
    {
        using (var analyzer = new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_30))
        {
            var queryParser = new QueryParser(Lucene.Net.Util.Version.LUCENE_30, "Description", analyzer);
            var collector = TopScoreDocCollector.Create(1000, true);
            var query = queryParser.Parse(expr);
            searcher.Search(query, collector);

            var result = new List<string>();
            var matches = collector.TopDocs().ScoreDocs;
            foreach (var item in matches)
            {
                var id = item.Doc;
                var doc = searcher.Doc(id);
                result.Add(doc.GetField("Gtin").StringValue);
            }
            return result;
        }
    }

    IndexWriter CreateIndex()
    {
        var directory = new RAMDirectory();

        var analyzer = new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_30);
        var writer = new IndexWriter(directory, analyzer, new IndexWriter.MaxFieldLength(1000));

        return writer;
    }
    void Add(IndexWriter writer, string desc, string id)
    {
        var document = new Document();
        document.Add(new Field("Description", desc, Field.Store.YES, Field.Index.ANALYZED));
        document.Add(new Field("Gtin", id, Field.Store.YES, Field.Index.NOT_ANALYZED));

        writer.AddDocument(document);
    }
}