I suspect this is because you set TopTermsScoringBooleanQueryRewrite method on the PrefixQuery: this will keep "only" the top 10K terms, so if g* matches more than 10K terms, some terms are dropped.
You may want to index short prefixes into the index instead, e.g. using EdgeNGramFilter, and then cutover to PrefixQuery when the prefix is "long enough". This is the approach I took with the index-based suggester on https://issues.apache.org/jira/browse/LUCENE-4845 ... Mike McCandless http://blog.mikemccandless.com On Fri, May 24, 2013 at 7:06 PM, Steven Schlansker <ste...@likeness.com> wrote: > Hi everyone, > > I am building an autocomplete index. The index contains both the names and a > small set of fixed types. > The intention is that type matches will always come first, followed by name > matches. > > I am using a PrefixQuery to do substring matching. Confusingly, I am finding > that very short prefix > matches sometimes will return no results when combined with an additional > filter. > > For example, I have a document "body:german type:TYPE". The query > "+(type:TYPE) +body:ge*" matches this document. > The query "+(type:TYPE) +body:g*" does not. Double confusingly, it works > fine in Luke -- just not when I build the query by hand. > > Here is how I create the document: > > Document doc = new Document(); > doc.add(new Field("body", "German", TextField.TYPE_STORED)); > doc.add(new Field("type", "TYPE", StringField.TYPE_STORED)); > > Here is how I build the query: > > Query allowedTypes = new BooleanQuery(); > allowedTypes.add(new TermQuery(new Term("type", "TYPE")), Occur.SHOULD); > > > Query prefixQuery = new PrefixQuery(new Term("body", "ge")); > prefixQuery.setRewriteMethod(new > MultiTermQuery.TopTermsScoringBooleanQueryRewrite(10000)); > > Query mainQuery = new BooleanQuery(); > mainQuery.add(allowedTypes, Occur.MUST); > mainQuery.add(prefixQuery, Occur.MUST); > > Am I missing something obvious? > > Thanks, > Steven Schlansker > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
