Hi
I have checked out the latest version of Lucene from CVS and have
found a change in the results compared to version 1.4.3.
The issue is with the deprecated API in the BooleanQuery class. The
deprecated function:
"public void add(Query query, boolean required, boolean prohibited)"
is returning different results to version 1.4.3.
Please find attached a sample program which should illustrate the
issue. (I also have a Maven 1 project.xml if you would like it).
Thanks
Pat
package com.test;
import java.io.IOException;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.PerFieldAnalyzerWrapper;
import org.apache.lucene.analysis.WhitespaceAnalyzer;
import org.apache.lucene.analysis.snowball.SnowballAnalyzer;
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.queryParser.ParseException;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.RAMDirectory;
import junit.framework.TestCase;
public class testCollectionType extends TestCase {
private String body = "body";
private String type = "type";
private String [] keyTypes = {
"Media",
"UserDefined"
};
private String [] bodyText = {
"The Queen has conducted a massive international fleet review "
+ "to mark the bicentenary of the Battle of Trafalgar.",
"1953: Queen Elizabeth takes coronation oath "
+ "Queen Elizabeth II has been crowned at a coronation
ceremony in Westminster Abbey in London. "
+ "In front of over 8,000 guests, including prime ministers
and heads of state from throughout "
+ "the Commonwealth, she took the Coronation Oath and is now
bound to serve her people and to "
+ "maintain the laws of God."
};
public void testType() throws IOException, ParseException {
Directory directory = new RAMDirectory();
IndexWriter writer = new IndexWriter(directory, getAnalyzer(), true);
for (int i = 0; i < keyTypes.length; i++) {
Document doc = new Document();
doc.add(Field.Keyword(type, keyTypes[i]));
doc.add(Field.UnStored(body, bodyText[i]));
writer.addDocument(doc);
}
writer.close();
IndexSearcher searcher = new IndexSearcher(directory);
Query query = getQuery();
Hits hits = searcher.search(query);
System.out.println("The query is: " + query.toString());
System.out.println("Found " + hits.length() + " records.");
for (int i = 0; i < hits.length(); i++) {
Document doc = hits.doc(i);
System.out.println("Type: " + doc.get(type) + ", Score: "
+ hits.score(i));
}
int count = hits.length();
searcher.close();
assertTrue("Should return 1 hit. Returned " + count, count == 1);
}
private Analyzer getAnalyzer() {
PerFieldAnalyzerWrapper analyzer = new
PerFieldAnalyzerWrapper(new SnowballAnalyzer("English"));
analyzer.addAnalyzer(type, new WhitespaceAnalyzer());
return analyzer;
}
private Query getQuery() throws ParseException {
BooleanQuery typeQuery = new BooleanQuery();
typeQuery.add(new TermQuery(new Term(type, "Media")),
BooleanClause.Occur.SHOULD);
BooleanQuery bodyQuery = new BooleanQuery();
bodyQuery.add(new TermQuery(new Term(body, "queen")),
BooleanClause.Occur.SHOULD);
BooleanQuery query = new BooleanQuery();
// ********************************************************************
// The new version of Lucene (from CVS) has deprecated the
// "BooleanQuery, add(Query, boolean, boolean)" function.
//
// The JavaDoc suggestion is to replace:
// add(typeQuery, true, false)
// with:
// add(typeQuery, BooleanClause.Occur.MUST)
//
// I think the deprecated function is now broken:
// 1) It returns a different result to Lucene 1.4.3
// 2) It returns a different result to the new version of the function.
//
// This section illustrates the issue:
// If you comment out the deprecated functions and un-comment the new
// functions you will get a different result. You should get the same
// result.
//
// query.add(typeQuery, BooleanClause.Occur.MUST);
// query.add(bodyQuery, BooleanClause.Occur.MUST);
query.add(typeQuery, true, false);
query.add(bodyQuery, true, false);
// ********************************************************************
return query;
}
}
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