But this BitSet strategy is more memory consuming mainly if you have documents in million numbers and categories in thousands. So I preferred in my project FieldCache strategy.
Jelda > -----Original Message----- > From: Kapil Chhabra [mailto:[EMAIL PROTECTED] > Sent: Tuesday, May 16, 2006 7:38 AM > To: java-user@lucene.apache.org > Subject: Re: Aggregating category hits > > Even I am doing the same in my application. > Once in a day, all the filters [for different categories] are > initialized. Each time a query is fired, the Query BitSet is > ANDed with the BitSet of each filter. The cardinality > obtained is the desired output. > @Eric: I would like to know more about the implementation > with DocSet in place of Bitset. > > Regards, > kapilChhabra > > > Erik Hatcher wrote: > > > > On May 15, 2006, at 5:07 PM, Marvin Humphrey wrote: > >> If you needed to know not just the total number of hits, but the > >> number of hits in each "category", how would you handle that? > >> > >> For instance, a search for "egg" would have to produce the 20 most > >> relevant documents for "egg", but also a list like this: > >> > >> Holiday & Seasonal / Easter 75 > >> Books / Cooking 52 > >> Miscellaneous 44 > >> Kitchen Collectibles 43 > >> Hobbies / Crafts 17 > >> [...] > >> > >> It seems to me that you'd have to retrieve each hit's > stored fields > >> and examine the contents of a "category" field. That's a lot of > >> overhead. Is there another way? > > > > My first implementation of faceted browsing uses BitSet's that get > > pre-loaded for each category value (each unique term in a "category" > > field, for example). And to intersect that with an actual Query, it > > gets run through the QueryFilter to get its BitSet and then AND'd > > together with each of the category BitSet's. Sounds like a lot, but > > for my applications there are not tons of these BitSet's and the > > performance has been outstanding. Now that I'm doing more > with Solr, > > I'm beginning to leverage its amazing caching infrastructure and > > replacing BitSet's with DocSet's. > > > > Erik > > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
