Lucene.Net了解为什么带有BooleanQuery的TermRangeQuery不会返回任何值

问题描述

我正在尝试对搜索结果应用过滤器，我可以成功地应用“完全匹配”过滤器，但是我试图理解为什么我尝试对字符串字段使用TermRangeQuery却没有结果。例如给定此索引（我在下面的示例中使用BooleanQuery，因为最终我希望应用一组过滤器）

    Dim stdAnalyzer As New StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_30)
    Dim iWriter As New IndexWriter(directory,stdAnalyzer,IndexWriter.MaxFieldLength.UNLIMITED)
    Dim doc As New Document

    doc.Add(New Field("Name","Apple",Field.Store.YES,Field.Index.ANALYZED))        ''analyzed fields
    doc.Add(New Field("Filter_Name",Field.Store.NO,Field.Index.NOT_ANALYZED))        ''non analyzed fields for exact matches/filtering
    iWriter.AddDocument(doc)

    doc = New Document
    doc.Add(New Field("Name","Apple Green","Banana","Banana Yellow","Orange Orange","Orange","Pear Green","Pear",Field.Index.NOT_ANALYZED))        ''non analyzed fields for exact matches/filtering


    iWriter.AddDocument(doc)
    iWriter.Commit()
    iWriter.dispose()
End Sub

我可以查询 Apple

的完全匹配项

    Using reader As IndexReader = IndexReader.Open(directory,True)
        Using Searcher As New IndexSearcher(reader)
            Using analyzer As New StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_30)
                Dim query As New MatchAllDocsQuery ''all docs

                Dim boolFilter As New BooleanQuery
                boolFilter.Add(New TermQuery(New Term("Filter_Name","Apple")),Occur.MUST) ''Exact match for Apple

                Dim filter As New QueryWrapperFilter(boolFilter)
                Dim collector = TopscoreDocCollector.Create(reader.MaxDoc,False)
                Searcher.Search(query,filter,collector)
            End Using
        End Using
    End Using

但是我想执行多于或少于该查询，我尝试使用TermRangeQuery在名称字段（已分析）之间中查找结果比Apple和Orange少，但返回0个结果。

                 Using reader As IndexReader = IndexReader.Open(directory,True)
        Using Searcher As New IndexSearcher(reader)
            Using analyzer As New StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_30)
                Dim query As New MatchAllDocsQuery ''all docs

                Dim boolFilter As New BooleanQuery
                boolFilter.Add(New TermRangeQuery("Name",True,True),Occur.MUST)

                Dim Filter As New QueryWrapperFilter(boolFilter)
                Dim collector = TopscoreDocCollector.Create(reader.MaxDoc,collector)

                Debug.WriteLine("Total hits Name TermRangeQuery (Apple TO Orange): " + collector.TotalHits.ToString)

                Dim topDocs = collector.TopDocs
                For Each scoreDoc In TopDocs.scoreDocs
                    Dim doc As Document = Searcher.Doc(scoreDoc.Doc)
                    Debug.WriteLine("Name: " + doc.GetField("Name").StringValue + " Doc ID: " + scoreDoc.Doc.ToString)
                Next

            End Using
        End Using
    End Using

对字段 Filter_Name （未分析）执行相同的查询，但确实返回结果。

Using reader As IndexReader = IndexReader.Open(directory,True)
        Using Searcher As New IndexSearcher(reader)
            Using analyzer As New StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_30)
                Dim query As New MatchAllDocsQuery ''all docs

                Dim boolFilter As New BooleanQuery
                boolFilter.Add(New TermRangeQuery("Filter_Name",collector)

                Debug.WriteLine("Total hits Name TermRangeQuery (Apple TO Orange): " + collector.TotalHits.ToString)

                Dim topDocs = collector.TopDocs
                For Each scoreDoc In TopDocs.scoreDocs
                    Dim doc As Document = Searcher.Doc(scoreDoc.Doc)
                    Debug.WriteLine("Name: " + doc.GetField("Name").StringValue + " Doc ID: " + scoreDoc.Doc.ToString)
                Next

            End Using
        End Using
    End Using

我在其他Lucene示例中看到，我应该能够使用通配符（例如[Orange TO *]）执行RangeQuery，但是如果我错过了某些东西，则无法产生任何结果过滤的原理或原理是基本的/显而易见的。

m。谢谢

解决方法

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