Thanks for reply,but I  am not know Solr well.
Does Solr base on lucene core or hack lucene core
to achieve the (categories amount)'s function ?
Can I achieve the similar function using 
lucene core ?
> From: erik@ehatchersolutions.com> To: java-user@lucene.apache.org> Subject: Re: how to statistics categories amount> Date: Sat, 28 Jun 2008 05:36:12 -0400> > > On Jun 28, 2008, at 3:57 AM, lutan wrote:> > if I search a keyword likes 'computer' in a shopping website.> > the result may contains.> > total:> > (1000) products .> > categories:> > pc (500) products .> > notebook (300) products .> > server (200) products .> >> > so how do get each categories 'amount.> > I try to search many times on onec user search,> > but it is so slow> > This is a case where you are probably better off starting with Solr, > which supports faceting natively.> > The main trick to making this fast is coming up with cached sets of > each of the categories and intersecting each of those sets with the > main result set and using the cardinality of the intersected sets for > the counts. Again, Solr is what I'd recommend as a starting point for > you.> > Erik> > > --------------------------------------
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