Just to be clear, this is for the use-case in which it is ok that potentially only 1 bucket gets filled.
2010/6/14 Geert-Jan Brits <gbr...@gmail.com> > First of all, > > Do you expect every query to return results for all 4 buckets? > i.o.w: say you make a Sortfield that sorts for score 4 first, than 3, 2, > 1. > When displaying the first 10 results, is it ok that these documents > potentially all have score 4, and thus only bucket 1 is filled? > > If so, I can think of the following out-of-the-box option works: (which I'm > not sure performs enough, but you can easily test it on your data) > > following your example create 4 fields: > 1. categoryExact - configure anaylzers so that only full matches score, > other > 2. categoryPartial - configure so that full and partial match (likely you > have already configured this) > 3. nameExact - like 1 > 4. namepartial - like 2 > > configure copyfields: 1 --> 2 and 3 --> 4 > this way your indexing client can stay the same as it likely is at the > moment. > > > Now you have 4 fields which scores you have to combine on search-time so > that the evenual scores are [1,4] > Out-of-the-box you can do this with functionqueries. > > http://wiki.apache.org/solr/FunctionQuery > > I don't have time to write it down exactly, but for each field: > - calc the score of each field (use the Query functionquery (nr 16 in the > wiki) . If score > 0 use the map function to map it to respectively > 4,3,2,1. > > now for each document you have potentially multiple scores for instance: 4 > and 2 if your doc matches exact and partial on category. > - use the max functionquery to only return the highest score --> 4 in this > case. > > You have to find out for yourself if this performs though. > > Hope that helps, > Geert-Jan > > > 2010/6/14 Fornoville, Tom <tom.fornovi...@truvo.com> > > I've been investigating this further and I might have found another path >> to consider. >> >> Would it be possible to create a custom implementation of a SortField, >> comparable to the RandomSortField, to tackle the problem? >> >> >> I know it is not your standard question but would really appreciate all >> feedback and suggestions on this because this is the issue that will >> make or break the acceptance of Solr for this client. >> >> Thanks, >> Tom >> >> -----Original Message----- >> From: Fornoville, Tom >> Sent: woensdag 9 juni 2010 15:35 >> To: solr-user@lucene.apache.org >> Subject: custom scorer in Solr >> >> Hi all, >> >> >> >> We are currently working on a proof-of-concept for a client using Solr >> and have been able to configure all the features they want except the >> scoring. >> >> >> >> Problem is that they want scores that make results fall in buckets: >> >> * Bucket 1: exact match on category (score = 4) >> * Bucket 2: exact match on name (score = 3) >> * Bucket 3: partial match on category (score = 2) >> * Bucket 4: partial match on name (score = 1) >> >> >> >> First thing we did was develop a custom similarity class that would >> return the correct score depending on the field and an exact or partial >> match. >> >> >> >> The only problem now is that when a document matches on both the >> category and name the scores are added together. >> >> Example: searching for "restaurant" returns documents in the category >> restaurant that also have the word restaurant in their name and thus get >> a score of 5 (4+1) but they should only get 4. >> >> >> >> I assume for this to work we would need to develop a custom Scorer class >> but we have no clue on how to incorporate this in Solr. >> >> Maybe there is even a simpler solution that we don't know about. >> >> >> >> All suggestions welcome! >> >> >> >> Thanks, >> >> Tom >> >> >
