chose77 at gmail
Apr 18, 2008, 9:25 AM
Post #6 of 10
(1223 views)
Permalink
|
Thank you very much Brian,
this works for me!
Chose
On Mon, Apr 14, 2008 at 8:58 PM, Beard, Brian <Brian.Beard [at] mybir> wrote:
> You can use your approach w/ or w/o the filter.
> > td = indexSearcher.search(query, filter, maxnumhits);
>
> You need to use a filter for the wildcards which is built in to the
> query.
>
> 1) Extend QueryParser to override the getWildcardQuery method.
> (Or even if you don't use QueryParser, just use the query api and
> combine the ConstantScoreQuery in #2 with your own query).
> 2) Inside of getWildcardQuery you need to return a
> ConstantScoreQuery(new WildcardFilter(new Term(field, termStr)))
> 3) The first execution will take longer to initialize, but subsequent
> searches are fairly fast.
> 4) Someone posted a WildcardFilter a while back which is below.
> 5) Now you can plug in to topDocs.
>
> public class WildcardFilter extends Filter {
>
> ...
>
> public BitSet bits(IndexReader reader) throws IOException {
> BitSet bits = new BitSet(reader.maxDoc());
> WildcardTermEnum enumerator = new WildcardTermEnum(reader,
> term);
> TermDocs termDocs = reader.termDocs();
>
> try {
> do {
> Term term = enumerator.term();
>
> if (term != null) {
> termDocs.seek(term);
>
> while (termDocs.next()) {
> bits.set(termDocs.doc());
> }
> } else {
> break;
> }
> } while (enumerator.next());
> } finally {
> termDocs.close();
> enumerator.close();
> }
>
> return bits;
> }
> -----Original Message-----
> From: Joe K [mailto:chose77 [at] gmail]
> Sent: Thursday, April 10, 2008 11:46 AM
> To: java-user [at] lucene
> Subject: Re: WildCardQuery and TooManyClauses
>
> Donna,
> so this doesn't work because search calls internaly
> MultiTermQuery.rewrite
> which causes TooManyClauses exception anyway even if the maxnumhits
> is set to 200 !!
>
> So I am lost again...
>
> Chose
>
>
> On Thu, Apr 10, 2008 at 3:02 PM, Donna L Gresh <gresh [at] us> wrote:
>
> > Doesn't the following do what you want with maxnumhits =200?
> > TopDocs td;
> > td = indexSearcher.search(query, filter, maxnumhits);
> > where filter can be null
> >
> >
> >
> > Donna L. Gresh
> > Services Research, Mathematical Sciences Department
> > IBM T.J. Watson Research Center
> > (914) 945-2472
> > http://www.research.ibm.com/people/g/donnagresh
> > gresh [at] us
> >
> >
> > "Joe K" <chose77 [at] gmail> wrote on 04/10/2008 08:53:06 AM:
> >
> > > Hello everybody,
> > > I know there was written a tons of words about this issue, but I'm
> just
> > not
> > > clear enough about it.
> > >
> > > I have these facts:
> > >
> > > 1. my query is always 1 letter and *, eg. M*
> > > 2. i always want to get max 200 results, no more!
> > > 3. i don't want to fix this issue by setting maxClauseCount
> > >
> > > I just don't see the easy way how to get my results, did i missed
> > something?
> > >
> > > From what I've read here I know that probably i should play with
> filters
> > or
> > > with WildCardEnum, but why?
> > > I just want to get simple this:
> > > SELECT FROM XXX WHERE XXX.name LIKE 'M%' LIMIT 200;
> > >
> > > (there is no filtering in this query except the wildcard itself)
> > >
> > > Please, what is the easiest solution to achieve this?
> > >
> > > Thanks in advance,
> > > Chose
> >
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe [at] lucene
> For additional commands, e-mail: java-user-help [at] lucene
>
>
|
