Hi, Thanks for your suggestions! Am new to Lucene...would appreciate if u could elaborate ur following point with an example:
> Add a separate field, say "days", in which you will put as many "1" as > many days elapsed since the epoch (not neccessarily since 1 Jan 1970 - > pick a date that makes sense for you). Then, if you want to prioritize > newer documents, just add "+days:1" to your query. Voila - the final > results are a sum of other score factors plus a score factor that is > higher for more recent document, containing more 1-s. Thanks again! Ed Steven A Rowe wrote: > > On 01/14/2009 at 10:44 PM, mitu2009 wrote: >> Is it possible to bubble up newer records in lucene search results? ie.I >> want Lucene to give a higher score to records which are closer to >> today's date. > > In addition to the fine ideas given by previous posters, Andrzej Bialecki > has described a technique that uses term frequency alone to affect the > score: from > <http://www.gossamer-threads.com/lists/lucene/java-user/43457>: > >> Here's the trick that works for me, without the issues of boost >> resolution or FunctionQuery. >> >> Add a separate field, say "days", in which you will put as many "1" as >> many days elapsed since the epoch (not neccessarily since 1 Jan 1970 - >> pick a date that makes sense for you). Then, if you want to prioritize >> newer documents, just add "+days:1" to your query. Voila - the final >> results are a sum of other score factors plus a score factor that is >> higher for more recent document, containing more 1-s. >> >> If you are dealing with large time spans, you can split this into years >> and days-in-a-year, and apply query boosts, like "+years:1^10.0 >> +days:1^0.02". Do some experiments and find what works best for you. > > As noted in a later thread discussing this issue > <http://www.gossamer-threads.com/lists/lucene/java-user/64482>, you should > turn norms off on the "days" field: > > <http://lucene.apache.org/java/2_4_0/api/org/apache/lucene/document/Fieldable.html#setOmitNorms(boolean)> > > Steve > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-dev-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-dev-h...@lucene.apache.org > > > -- View this message in context: http://www.nabble.com/Bubbling-up-newer-records-tp21470766p21492085.html Sent from the Lucene - Java Developer mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: java-dev-unsubscr...@lucene.apache.org For additional commands, e-mail: java-dev-h...@lucene.apache.org
