Question

Lucene.Net query problem

Asked by: SHAHEEN_AKHTAR

I have indexed a dictionary using Lucene.Net.
I tried to get the results using alphabetical search like A*.
In some of the cases I get System Error Exception.
I am new to Lucene.Net and could not diagnise the problem. I am Appending the code o create Index document and the query code.
Request experts comments.

Thanks a lot in advance.

IndexWriter writer1 = new IndexWriter(sIndexPath,new StandardAnalyzer(), false);
IndexDocumentDictionary(writer1,EnglishWord,meaning,type,pronounciation);
private static void IndexDocumentDictionary(IndexWriter writer, string English, string Hindi, string Type, string Pronounciation)
{
Document doc = new Document();
doc.Add(new Field("english", EnglishWord, Field.Store.YES, Field.Index.TOKENIZED));
doc.Add(new Field("meaning", meaning, Field.Store.YES, Field.Index.TOKENIZED));
doc.Add(new Field("type", type, Field.Store.YES, Field.Index.TOKENIZED));
doc.Add(new Field("pronounciation", pronounciation, Field.Store.YES, Field.Index.TOKENIZED));
writer.AddDocument(doc);
}
 
Query:
 
public DataTable SearchInDictionaryHindi(string englishiWord)
{
Lucene.Net.Search.IndexSearcher searcher = new Lucene.Net.Search.IndexSearcher("DictionaryIndex/");
 
Lucene.Net.QueryParsers.QueryParser oParser = new Lucene.Net.QueryParsers.QueryParser("english", new StandardAnalyzer());
 
string qry = "(english:" + hindiWord + "*" + ")";
//On executing the below line some times I get System Error exception.
Raftaar.Net.Search.Hits oHitColl = searcher.Search(oParser.Parse(qry));
}
 
 
 
 
}

                                  
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Asked On
2009-01-01 at 20:03:34ID24020017
Topic

Search Engines

Participating Experts
1
Points
500
Comments
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Answers

 

by: teesubPosted on 2009-01-02 at 15:37:40ID: 23283218

Hello,

I am not sure about .NET, but from my experience with lucene in JAVA, wildcard or prefix querries tend to throw TooManyClauses exception. So you might want to check that.

This is because the query is rewritten enumerating the terms which satify your query, for example if you have Abc, Acd, Ade etc terms in your "english" field then your querry for english:A* will be rewritten as english:(Abc OR Acd OR Ade).

The more the wildcard is near the start of your search term, the problem is bigger.

One way to get around of this is BooleanQuery.setMaxClauseCount(...) [please lookup the .NET equivalent] but again its not foolproof.

The good way to do this is to get a ConstantScoreQuery from a WildCardFilter. But I can help you only with JAVA code snips...

Let me know if this helped or you need more information.

 

by: SHAHEEN_AKHTARPosted on 2009-01-03 at 05:14:46ID: 23285085

Thanks teesub.

I will examine this and comeback to you. The APIs and classes are almost same in JAVA Lucene and Lucene.Net.

Regards

 

by: SHAHEEN_AKHTARPosted on 2009-01-04 at 20:21:10ID: 23293012

Can you give me the JAVA Lucene example on

ConstantScoreQuery from a WildCardFilter

I could get through  by setting the BooleanQuery.setMaxClauseCount to double the default.

I also want to try the ConstantScoreQuery also

Regards

 

by: teesubPosted on 2009-01-05 at 00:42:31ID: 23293780

WildCardFilter does not exist in lucene (it is in solr). An implementation (same in principle as solr) exists in the forums which I have provided below.

Once you use the WildCardFilter to construct the ConstantScoreQuery you will get rid of your problem.

Hope this helps.

public class WildcardFilter extends Filter {
    private Term term;
    public WildcardFilter(Term term) {
        this.term = term;
    }
    public BitSet bits(IndexReader reader) throws IOException {
        BitSet bits = new BitSet(reader.maxDoc());
        WildcardTermEnum enumerator = new WildcardTermEnum(reader, term);
        TermDocs termDocs = reader.termDocs();
        try {
          do {
            Term term = enumerator.term();
            if (term != null )
            {
              termDocs.seek(term);
              while (termDocs.next()) {
                bits.set(termDocs.doc());
              }
            } else {
              break;
            }
          } while (enumerator.next());
        } finally {
          termDocs.close();
          enumerator.close();
        }
      return bits;
    }
}
                                              
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by: SHAHEEN_AKHTARPosted on 2009-01-05 at 19:59:11ID: 23301813

Thanks Teesub. I will try it and comeback.

 

by: SHAHEEN_AKHTARPosted on 2009-09-17 at 00:37:33ID: 31530246

Thankz

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