Hi,
could anyone please tell me if the following behavior is expected in
Lucene 4.5?
Let's assume we have an index with two documents:
1. contents: "test bunga bunga test"
2. contents: "test bunga test"
We run two SpanNearQueries against this index:
1. spanNear([contents:bunga, contents:bunga], 0, true)
2. spanNear([contents:bunga, contents:bunga], 0, false)
For the first query we get 1 hit. The first document in the example
above gets matched and the second one doesn't. This make sense, because
we want a the term "bunga" followed by another "bunga" here.
For the second query both documents get matched. Why does the second
document with a single occurrence of 'bunga' get matched?
A complete example follows.
Thanks in advance!
Piotr
-----------
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.TopDocs;
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.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.util.Version;
import java.io.StringReader;
import static org.junit.Assert.assertEquals;
class SpansBug {
public static void main(String [] args) throws Exception {
Directory dir = new RAMDirectory();
Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_45);
IndexWriterConfig iwc = new
IndexWriterConfig(Version.LUCENE_45, analyzer);
IndexWriter writer = new IndexWriter(dir, iwc);
String contents = "contents";
Document doc1 = new Document();
doc1.add(new TextField(contents, new StringReader("test bunga
bunga test")));
Document doc2 = new Document();
doc2.add(new TextField(contents, new StringReader("test bunga
test")));
writer.addDocument(doc1);
writer.addDocument(doc2);
writer.commit();
IndexSearcher searcher = new
IndexSearcher(DirectoryReader.open(dir));
SpanQuery stq1 = new SpanTermQuery(new Term(contents,"bunga"));
SpanQuery stq2 = new SpanTermQuery(new Term(contents,"bunga"));
SpanQuery [] spqa = new SpanQuery[]{stq1,stq2};
SpanNearQuery spanQ1 = new SpanNearQuery(spqa,0, true);
SpanNearQuery spanQ2 = new SpanNearQuery(spqa,0, false);
System.out.println(spanQ1);
TopDocs tdocs1 = searcher.search(spanQ1,10);
assertEquals(tdocs1.totalHits ,1);
System.out.println(spanQ2);
TopDocs tdocs2 = searcher.search(spanQ2,10);
//Why does the following assertion fail?
assertEquals(tdocs2.totalHits ,1);
}
}
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