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 > >
