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Subject: RE: SpanNearQuery - inOrder parameter
Date: Tue, 10 May 2011 13:58:40 +0100
Message-ID: 
 <614C529D389A5944B351F7DFB7594F240121F971@uksrpblkexb01.detica.com>
In-Reply-To: 
 <614C529D389A5944B351F7DFB7594F240121F73B@uksrpblkexb01.detica.com>
Thread-Topic: SpanNearQuery - inOrder parameter
Thread-Index: AcwOPEbkaZW7+4fxTMa8XpOLIMqV8wAAHD7gADVO2HA=
References: 
 <614C529D389A5944B351F7DFB7594F240121F737@uksrpblkexb01.detica.com>
 <614C529D389A5944B351F7DFB7594F240121F73B@uksrpblkexb01.detica.com>
From: "Gregory Tarr" <Gregory.tarr@detica.com>
To: <java-user@lucene.apache.org>

Anyone able to help me with the problem below?

Thanks

Greg=20

-----Original Message-----
From: Gregory Tarr [mailto:Gregory.tarr@detica.com]=20
Sent: 09 May 2011 12:33
To: java-user@lucene.apache.org
Subject: RE: SpanNearQuery - inOrder parameter

Attachment didn't work - test below:
=20
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field; import
org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.TopDocsCollector;
import org.apache.lucene.search.TopScoreDocCollector;
import org.apache.lucene.search.spans.SpanNearQuery;
import org.apache.lucene.search.spans.SpanQuery;
import org.apache.lucene.search.spans.SpanTermQuery;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.util.Version;
import org.junit.Assert;
import org.junit.Test;
=20
public class TestSpanNearQueryInOrder {
=20
@Test
public void testSpanNearQueryInOrder() {  RAMDirectory directory =3D new
RAMDirectory();  IndexWriter writer =3D new IndexWriter(directory, new
StandardAnalyzer(Version.LUCENE_29), true,
IndexWriter.MaxFieldLength.UNLIMITED);
 TopDocsCollector collector =3D TopScoreDocCollector.create(3, false);
=20
 Document doc =3D new Document();
=20
 // DOC1
 doc.add(new Field("text","dddd aaaa bbbb cccc", Field.Store.YES,
Field.Index.ANALYZED));
=20
 writer.addDocument(doc);
 doc =3D new Document();=20
=20
 // DOC2
 doc.add(new Field("text","dddd aaaa aaaa cccc"));
=20
 writer.addDocument(doc);
 doc =3D new Document();
=20
 // DOC3
 doc.add(new Field("text","dddd aaaa yyyy aaaa xxxx cccc"));
=20
 writer.addDocument(doc);
 writer.optimize();
 writer.close();
=20
 searcher =3D new IndexSearcher(directory, false);
=20
 SpanQuery[] clauses =3D new SpanQuery[2];  clauses[0] =3D new
SpanTermQuery(new Term("text", "aaaa"));  clauses[1] =3D new
SpanTermQuery(new Term("text", "aaaa"));
=20
 // Don't care about order, so setting inOrder =3D false  SpanNearQuery =
q
=3D new SpanNearQuery(clauses, 1, false);  searcher.search(q, =
collector);
=20
 // This assert fails - 3 docs are returned. Expecting only DOC2 and
DOC3
 Assert.assertEquals("Check 2 results", 2, collector.getTotalHits());=20
=20
 collector =3D new TopScoreDocCollector.create(3, false);  clauses =3D =
new
SpanQuery[2];  clauses[0] =3D new SpanTermQuery(new Term("text", =
"aaaa"));
clauses[1] =3D new SpanTermQuery(new Term("text", "aaaa"));
=20
 // Don't care about order, so setting inOrder =3D false  q =3D new
SpanNearQuery(clauses, 0, false);  searcher.search(q, collector);
=20
 // This assert fails - 3 docs are returned. Expecting only DOC2
Assert.assertEquals("Check 1 result", 1, collector.getTotalHits()); }
=20
}

________________________________

From: Gregory Tarr [mailto:Gregory.tarr@detica.com]
Sent: 09 May 2011 12:29
To: java-user@lucene.apache.org
Subject: SpanNearQuery - inOrder parameter


I attach a junit test which shows strange behaviour of the inOrder
parameter on the SpanNearQuery constructor, using Lucene 2.9.4.

My understanding of this parameter is that true forces the order and
false doesn't care about the order.=20

Using true always works. However using false works fine when the terms
in the query are distinct, but if they are equivalent, e.g. searching
for "john john", I do not get the expected results. The workaround seems
to be to always use true for queries with repeated terms.

Any help?=20

Thanks=20

Greg=20

<<TestSpanNearQueryInOrder.java>>=20


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Detica Limited is registered in England under No: 1337451.

Registered offices: Surrey Research Park, Guildford, Surrey, GU2 7YP,
England.


Please consider the environment before printing this email.

This message should be regarded as confidential. If you have received
this email in error please notify the sender and destroy it immediately.
Statements of intent shall only become binding when confirmed in hard
copy by an authorised signatory.  The contents of this email may relate
to dealings with other companies within the Detica Limited group of
companies.

Detica Limited is registered in England under No: 1337451.

Registered offices: Surrey Research Park, Guildford, Surrey, GU2 7YP,
England.

Please consider the environment before printing this email.

This message should be regarded as confidential. If you have received thi=
s email in error please notify the sender and destroy it immediately.
Statements of intent shall only become binding when confirmed in hard cop=
y by an authorised signatory.  The contents of this email may relate to d=
ealings with other companies within the Detica Limited group of companies=
=2E

Detica Limited is registered in England under No: 1337451.

Registered offices: Surrey Research Park, Guildford, Surrey, GU2 7YP, Eng=
land.
=0D

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