Peter, You want to do a facet query. This kind of functionality is not in Lucene-core (sadly), but both Solr (the fully featured search application built on Lucene) and bobo-browse (just a library, like Lucene itself) are open-source and work with Lucene to provide faceting capabilities for you.
-jake On Sun, Nov 22, 2009 at 8:42 AM, Peter 4U <pete...@hotmail.com> wrote: > > Hello Lucene Experts, > > I wonder if someone might be able to shed some insight on this interesting > scoring question: > > The problem: > Build a search query that will return [ordered] hits by the top number of > occurences of field values across matched documents (or as close to this as > possible). > The built-in scoring is great for scoring number of hits within a document, > but is there an efficient way to do this across the same field in a set of > matched documents? (maybe scoring isn't the best way?) > > Example: > Let's say you have an index containing book information. Each document has > a 'title' field. > Let's say the index contains 100 entries, with: > 65 'title's containing the word 'tiger' > 21 containing 'lion' > 6 containing 'panther' > 5 containing 'kitten' > 3 containing 'slug' > > What would be the best way to build a query such that returned documents > are ordered in this way: > Rank Value Occurences > ================================ > 1 tiger 65 > 2 lion 21 > 3 panther 6 > 4 kitten 5 > 5 slug 3 > > I can, of course, build a standard query, traverse the returned documents > and build such a list, but if the returned query had many 100,000's of hits, > the performance would degrade linearly, particularly if only the 'Top 5' are > actually required. > > > One idea is to maintain a separate index with this information - the main > problem with this is that you essentially need to know what you're searching > for at index-time, which isn't ideal. > > > Has anyone come across and solved this particular issue using Lucene? > > Many thanks, > Peter > > > > _________________________________________________________________ > Add your Gmail and Yahoo! Mail email accounts into Hotmail - it's easy > http://clk.atdmt.com/UKM/go/186394592/direct/01/ >
