John,
Using the FieldCache worked well. Thanks!
-Murali
On Thu, Dec 4, 2008 at 3:10 PM, John Wang <[EMAIL PROTECTED]> wrote:
> Easiest way to do this is using the FieldCache. It constructs a StringIndex
> object which gives you very fast lookup to the field value (index) given a
> docid. Create a parallel count array to the lookup array for the
> StringIndex. Run your HitCollector thru should be fast.
> Loading FieldCache maybe expensive, but you do it only once when opening
> the
> reader.
>
> This is one way of implementing Faceted Search with Lucene but there are
> lotsa things you can do to make this faster.
>
> This is of course assuming your Brand field is indexed and not tokenized.
>
> One side-benefit is that if you do this, sorting on Brand would be fast
> because FieldCache would be already loaded.
>
> Hope this helps
>
> -John
>
>
> On Thu, Dec 4, 2008 at 3:02 PM, Muralidharan V <[EMAIL PROTECTED]
> >wrote:
>
> > We are evaluating lucene for a product search engine. One requirement is
> > that we be able to suggest the top n brands(the ones with most products
> in
> > the result set) for a given search term to further refine the search
> query.
> > The brand is stored in a separate field and searches are performed
> against
> > product description and brand.
> >
> > One option is to use a custom HitCollector to keep track of the brands in
> > the result set but that would require reading the brand field for each
> doc
> > that matches the search term. We think this will be an order of magnitude
> > slower. Is there anything else that we can do?
> >
> > Thanks,
> > Murali
> >
>
