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Posted to dev@lucenenet.apache.org by GitBox <gi...@apache.org> on 2020/08/07 19:52:18 UTC

[GitHub] [lucenenet] jregnier opened a new issue #324: Exclude query help

jregnier opened a new issue #324:
URL: https://github.com/apache/lucenenet/issues/324


   Hey guys, wondering if I could get a hand with a query I'm struggling with. My index is structured with a parent-child relationship. When I do a search I look at the child documents and then load the parent document associated with it. So my issue is that when I do an exclude I get documents I don't want back. For example, for a given parent, if one child is "lucene is awesome" and another child document is "lucene is great", then if I search for "+lucene -great" I still get the parent since it hit on the first child which makes sense but is there a way to filter out the parent that has 1 child document that fails the criteria?
   
   thanks


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[GitHub] [lucenenet] rclabo commented on issue #324: Exclude query help

Posted by GitBox <gi...@apache.org>.
rclabo commented on issue #324:
URL: https://github.com/apache/lucenenet/issues/324#issuecomment-670718913


   Thanks that helpful and answers the questions I raised.  Unfortunately several methods being used are ones that I don't have experience with and the code is too psudo codish for me to easily repo the issue and work towards a solution.  So I'm gonna hope that someone with more experience than I jumps in to help.


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[GitHub] [lucenenet] jregnier commented on issue #324: Exclude query help

Posted by GitBox <gi...@apache.org>.
jregnier commented on issue #324:
URL: https://github.com/apache/lucenenet/issues/324#issuecomment-671398005


   So I ended up figuring it out, turns out you can combine 2 ToParentBlockJoinQuery into a BooleanQuery so I just added an exclude query and voila. Thanks for the help


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[GitHub] [lucenenet] jregnier commented on issue #324: Exclude query help

Posted by GitBox <gi...@apache.org>.
jregnier commented on issue #324:
URL: https://github.com/apache/lucenenet/issues/324#issuecomment-670698083


   thanks for the response, see below 
   
   `analyzer uses a chartokenizer with a lowercase filter
   
   var dir = FSDirectory.Open(indexFolderPath);
   var indexConfig = new IndexWriterConfig(LuceneVersion.LUCENE_48, {analyzer});
   _writer = new IndexWriter(dir, indexConfig);
   
   var parentDocument = new Document();
   parentDocument.Add({BinaryDocValuesField});
   parentDocument.Add({StringField});
   parentDocument.Add({StringField});
   parentDocument.Add({StringField});
   
   var childDocument = new Document();
   childDocument.Add({StringField});
   childDocument.Add({StringField});
   childDocument.Add({TextField}) // not stored;
   childDocument.Add({StringField}) // only some documents will have this;
   
   // we are creating a parent child relationship with this list of documents
   _writer.AddDocuments(documentList)
   
   _reader = DirectoryReader.Open(FSDirectory.Open(indexFolderPath));
   _searcher = new IndexSearcher(_reader);
   BooleanQuery.MaxClauseCount = int.MaxValue;
   
   var searchString = "value:test search string"
   var terms = new SpanMultiTermQueryWrapper(new WildcardQuery(new Term(fieldName, word)) // terms is a list of these for each word
   var childQuery = new SpanNearQuery(terms, 0, true)
   
   var parentFilter = new FixedBitSetCachingWrapperFilter(
      new QueryWrapperFilter(
         new TermQuery(
            new Term(fieldName, value))));
   
   var query = ToParentBlockJoinQuery(childQuery, parentFilter, ScoreMode.Max);
   
   var sort = new Sort(new SortField(null, SortFieldType.DOC));
   return _searcher.Search(query, _reader.NumDocs, sort)`


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[GitHub] [lucenenet] jregnier closed issue #324: Exclude query help

Posted by GitBox <gi...@apache.org>.
jregnier closed issue #324:
URL: https://github.com/apache/lucenenet/issues/324


   


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[GitHub] [lucenenet] rclabo commented on issue #324: Exclude query help

Posted by GitBox <gi...@apache.org>.
rclabo commented on issue #324:
URL: https://github.com/apache/lucenenet/issues/324#issuecomment-670690698


   Can you provide more detail on how you implemented your  parent child relationship?  Also when you do a search on the child documents, how are you then loading the parent document associated with each child?  Finally, what version of Lucene.Net are you using?


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