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https://issues.apache.org/jira/browse/LUCENE-3442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13108936#comment-13108936
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Uwe Schindler commented on LUCENE-3442:
---------------------------------------
The issue is caused by LUCENE-2829, committed January and exists since Lucene
3.1.
> QueryWrapperFilter gets null DocIdSetIterator when wrapping TermQuery
> ---------------------------------------------------------------------
>
> Key: LUCENE-3442
> URL: https://issues.apache.org/jira/browse/LUCENE-3442
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/search
> Affects Versions: 3.1, 3.2, 3.3, 3.4
> Environment: java 1.6.0_27
> Reporter: Dan
> Assignee: Uwe Schindler
> Priority: Minor
> Fix For: 3.5
>
> Attachments: LUCENE-3442.patch
>
>
> 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:
> {code:java}
> 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();
> }
> }
> }
> {code}
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