[LUCENE-3442] QueryWrapperFilter gets null DocIdSetIterator when wrapping TermQuery

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.1, 3.2, 3.3, 3.4
• Fix Version/s: 3.5
• Component/s: core/search

Environment

java 1.6.0_27

• Lucene Fields: New
• Assignee: Uwe Schindler
• Reporter: Dan Climan
• Created: 20/Sep/11 18:46
• Updated: 28/Aug/22 12:57
• Resolved: 20/Sep/11 19:16

Description

If you try to get the iterator for the DocIdSet returned by a QueryWrapperFilter which wraps a TermQuery you get null instead of an iterator that returns the same documents as the search on the TermQuery.

Code demonstrating the issue:

import java.io.IOException;
import org.apache.lucene.analysis.WhitespaceAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.Field.Index;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.util.Version;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.QueryWrapperFilter;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TopDocs;

public class TestQueryWrapperFilterIterator {
   public static void main(String[] args) {
		try {
			IndexWriterConfig iwconfig = new IndexWriterConfig(Version.LUCENE_34, new WhitespaceAnalyzer(Version.LUCENE_34));
			iwconfig.setOpenMode(IndexWriterConfig.OpenMode.CREATE);
			RAMDirectory dir = new RAMDirectory();
		
			IndexWriter writer = new IndexWriter(dir, iwconfig);
			Document d = new Document();
			d.add(new Field("id", "1001", Store.YES, Index.NOT_ANALYZED));
			d.add(new Field("text", "headline one group one", Store.YES, Index.ANALYZED));
			d.add(new Field("group", "grp1", Store.YES, Index.NOT_ANALYZED));
		    writer.addDocument(d);
			writer.commit();
			writer.close();
			
			IndexReader rdr = IndexReader.open(dir);
			IndexSearcher searcher = new IndexSearcher(rdr);
			
			TermQuery tq = new TermQuery(new Term("text", "headline"));
			
			TopDocs results = searcher.search(tq, 5);
			System.out.println("Number of search results: " + results.totalHits);
			
			Filter f = new QueryWrapperFilter(tq);
			
			DocIdSet dis = f.getDocIdSet(rdr);
			
			DocIdSetIterator it = dis.iterator();
			if (it != null) {
				int docId = it.nextDoc();
				while (docId != DocIdSetIterator.NO_MORE_DOCS) {
					Document doc = rdr.document(docId);
					System.out.println("Iterator doc: " + doc.get("id"));
					docId = it.nextDoc();
				}
			} else {
				System.out.println("Iterator was null: ");
			}
			
			searcher.close();
			rdr.close();
		} catch (IOException ioe) {
			ioe.printStackTrace();
		}

	}
}