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