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https://issues.apache.org/jira/browse/LUCENENET-80?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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George Aroush reassigned LUCENENET-80:
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Assignee: George Aroush
> MultiSearcher with BooleanQuery
> --------------------------------
>
> Key: LUCENENET-80
> URL: https://issues.apache.org/jira/browse/LUCENENET-80
> Project: Lucene.Net
> Issue Type: Bug
> Environment: Windows Server 2003, Lucene.Net 2.0
> Reporter: Michael Garski
> Assignee: George Aroush
>
> When using a MultiSearcher with a HitCollector and a BooleanQuery with two
> identical terms an ArgumentException is thrown. This does not happen when
> using Hits. Sample code to reproduce:
> public void TestBoolean(string index)
> {
> IndexSearcher searcher = new IndexSearcher(index);
> SimpleCollector sc = new SimpleCollector();
> QueryParser qp = new QueryParser("Body", new
> StandardAnalyzer());
> searcher.Search(qp.Parse("test AND test"), null, sc);
> sc.Hits = 0;
> MultiSearcher ms = new MultiSearcher(new Searchable[] {
> searcher });
> ms.Search(qp.Parse("test AND test"), null, sc);
> }
> public class SimpleCollector : HitCollector
> {
> public int Hits = 0;
> public override void Collect(int doc, float score)
> {
> Hits++;
> }
> }
> The stack trace on the exception is:
> System.ArgumentException: Item has already been added. Key in dictionary:
> 'Body:test' Key being added: 'Body:test'
> at System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean
> add)
> at System.Collections.Hashtable.Add(Object key, Object value)
> at Lucene.Net.Search.TermQuery.ExtractTerms(Hashtable terms)
> at Lucene.Net.Search.BooleanQuery.ExtractTerms(Hashtable terms)
> at Lucene.Net.Search.BooleanQuery.ExtractTerms(Hashtable terms)
> at Lucene.Net.Search.MultiSearcher.CreateWeight(Query original)
> The issue is within TermQuery.ExtractTerms(Hashtable terms), where the term
> is added to the Hashtable when the key already exists. The Java version uses
> a Set, which allows a key to be added twice to the collection.
> A change in TermQuery from:
> public override void ExtractTerms(System.Collections.Hashtable
> terms)
> {
> Term term = GetTerm();
> terms.Add(term, term);
> }
> to:
> public override void ExtractTerms(System.Collections.Hashtable
> terms)
> {
> Term term = GetTerm();
> terms[term] = term;
> }
> Will correct this issue. You could check the Hastable using ContainsKey, but
> this case should be rare and overwriting the previous term in the collection
> would probably be better.
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