You can use the map() function for this, see http://wiki.apache.org/solr/FunctionQuery#map
q=a fox&defType=dismax&qf=allfields&bf=map(query($qq),0,0,0,100.0)&qq=allfields:(quick AND brown AND fence) This adds a constant boost of 100.0 if the $qq field returns a non-zero score, which it does whenever all three terms match. PS: You can achieve the same in a Lucene query, using q=a fox _val_:"map(query($qq),0,0,0,100.0)" -- Jan Høydahl, search solution architect Cominvent AS - www.cominvent.com Training in Europe - www.solrtraining.com On 17. aug. 2010, at 22.48, Ahmet Arslan wrote: >> Most of the time, items that match all three terms will >> float to the top by >> normal ranking, but sometimes there are only two terms that >> are like a rash >> across the record, and they end up with a higher score than >> some items that >> match all three query terms. >> >> I'd like to boost items with all the query terms to the top >> *without >> changing their order*. >> >> My first thought was to use a simple boost query >> allfields:(a AND b AND c), >> but the order of the set of records that contain all three >> terms changes >> when I do that. What I *think* I need to do is basically to >> say, "Hey, all >> the items with all three terms get an extra 40,000 points, >> but change >> nothing else". > > This is a hard task, and I am not sure it is possible. But you need to change > similarity algorithm for that. Final score is composed of many factors. > coord, norm, tf-idf ... > > http://lucene.apache.org/java/2_4_0/api/org/apache/lucene/search/Similarity.html > > May be you can try to customize coord(q,d). But there can be always some > cases that you describe. For example very long document containing three > terms will be punished due to its length. A very short document with two > query terms can pop-up before it. > > It is easy to "rank items with all three terms" so that they comes first, > (omitNorms="true" and omitTermFreqAndPositions="true" should almost do it) > but "change nothing else" part is not. > > Easiest thing can be throw additional query with pure AND operator and > display these result in a special way. > > >
