Hi Paul, Isn't SpanFirstQuery only match those with position less than a certain end position?
I am rather looking for a query that would score a document higher for terms appear near the start but not totally discard those with terms appear near the end. Regards, Cedric On 8/2/07, Paul Elschot <[EMAIL PROTECTED]> wrote: > Cedric, > > SpanFirstQuery could be a solution without payloads. > You may want to give it your own Similarity.sloppyFreq() . > > Regards, > Paul Elschot > > On Thursday 02 August 2007 04:07, Cedric Ho wrote: > > Thanks for the quick response =) > > > > On 8/1/07, Shailendra Sharma <[EMAIL PROTECTED]> wrote: > > > Yes, it is easily doable through "Payload" facility. During indexing > process > > > (mainly tokenization), you need to push this extra information in each > > > token. And then you can use BoostingTermQuery for using Payload value to > > > include Payload in the score. You also need to implement Similarity for > this > > > (mainly scorePayload method). > > > > If I store, say a custom boost factor as Payload, does it means that I > > will store one more byte per term per document in the index file? So > > the index file would be much larger? > > > > > > > > Other way can be to extend SpanTermQuery, this already calculates the > > > position of match. You just need to do something to use this position > value > > > in the score calculation. > > > > I see that SpanTermQuery takes a TermPositions from the indexReader > > and I can get the term position from there. However I am not sure how > > to incorporate it into the score calculation. Would you mind give a > > little more detail on this? > > > > > > > > One possible advantage of SpanTermQuery approach is that you can play > > > around, without re-creating indices everytime. > > > > > > Thanks, > > > Shailendra Sharma, > > > CTO, Ver se' Innovation Pvt. Ltd. > > > Bangalore, India > > > > > > On 8/1/07, Cedric Ho <[EMAIL PROTECTED]> wrote: > > > > > > > > Hi all, > > > > > > > > I was wondering if it is possible to do boosting by search terms' > > > > position in the document. > > > > > > > > for example: > > > > search terms appear in the first 100 words, or first 10% words, or in > > > > first two paragraphs would be given higher score. > > > > > > > > Is it achievable through using the new Payload function in lucene 2.2? > > > > Or are there any easier ways to achieve these ? > > > > > > > > > > > > Regards, > > > > Cedric > > > > > > > > --------------------------------------------------------------------- > > > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > > > > > > > > > Thanks, > > Cedric > > > > --------------------------------------------------------------------- > > 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] > > -- [EMAIL PROTECTED]
