Hi,
i've got problems while using wildcard and fuzzy searches.
While indexing a bunch of documents it could happen that a field of all
documents will be left empty (empty String).
I don't know wether this field will be included into the index at all.
But this leads to a problem while searching. If i create some Queries
(actually this does the QueryParser for me) on that field and run a
search with these queries, i would expect no results.
However, WildcardQuery and FuzziQuery sometimes generate a
NullPointerException in WildcardTermEnum.termCompare(...).
It seems to me that this does not happen if i add an additional unused
field to all documents but it may be that this works for me due to other
reasons. To explain what i mean, i've attached some lines of test code.
btw: I'm using lucene nightly-build 20020814.
Am i missing something or is this a bug?
Another question: An WildcardQuery that is constructed of only
non-wildcards gives me an StringIndexOutOfBoundsException while
searching. Shouldn't this be handled in a smarter way?
Thanks in advance,
Bjoern
import org.apache.lucene.search.*;
import org.apache.lucene.index.*;
import org.apache.lucene.store.*;
import org.apache.lucene.analysis.*;
import org.apache.lucene.document.*;
import org.apache.lucene.queryParser.*;
public class Tester {
public void testMe (boolean additionalField) throws Exception {
RAMDirectory indexStore = new RAMDirectory();
IndexWriter writer = new IndexWriter(indexStore, new SimpleAnalyzer(),
true);
Document doc = new Document();
doc.add(Field.Text("bar0", "foo"));
doc.add(Field.Text("bar1", ""));
// magical unused extra field
if (additionalField)
doc.add(Field.Text("bar2", "foo"));
writer.addDocument(doc);
writer.optimize();
writer.close();
IndexSearcher searcher = new IndexSearcher(indexStore);
Query[] queries = new Query[3];
queries[0] = new WildcardQuery(new Term("bar0", "f?o")); //
works as expected
queries[1] = new TermQuery(new Term("bar1", "foo")); //
this one too
queries[2] = new WildcardQuery(new Term("bar1", "f?o")); //
strange
Hits result;
for (int q = 0; q < queries.length; q++) {
System.out.println ("Query " + q + " (" +
queries[q].getClass().getName() + ")");
System.out.println ("\ttoString (\"bar0\") = " +
queries[q].toString ("bar0"));
System.out.println ("\ttoString (\"bar1\") = " +
queries[q].toString ("bar1"));
result = searcher.search(queries[q]);
if (result.length() == 0) {
System.out.println ("\tno results");
}
for (int i = 0; i < result.length(); i++) {
Document d = result.doc(i);
System.out.println ("\tresult: " + d.get ("bar0") + "
- " + d.get ("bar1"));
}
}
}
public static void main(String[] _argv) {
Tester t = new Tester();
try {
System.out.println ("## With additional unused extra field it
works");
t.testMe(true);
}
catch (Throwable th) {
System.err.println ("OOPS: " + th.getMessage());
th.printStackTrace();
}
try {
System.out.println ("\n## Without additional unused extra
field it won't work");
t.testMe(false);
}
catch (Throwable th) {
System.err.println ("OOPS: " + th.getMessage());
th.printStackTrace();
}
}
}
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