As you've seen RankQueries won't currently have any effect on Grouping queries.
A RankQuery can be combined with Collapse and Expand though. You may want to review Collapse and Expand and see if it meets your use case. Joel Bernstein http://joelsolr.blogspot.com/ On Wed, Jul 15, 2015 at 2:36 PM, Diego Ceccarelli < diego.ceccare...@gmail.com> wrote: > Hi Everyone, > > I need to use a RankQuery within a grouping [1]. > I did some experiments with RerankQuery [2] and solr 4.10.2 and it seems > that > if you group on a field, the reranking query is completely ignored > (on the cloud, and on a single instance). > I would expect to see the results in each group reranked using the > RerankQuery. > > I had a look at the grouping code and documentation and, > if I correctly understood, the grouping works in two steps: > > 1) first the top groups are retrieved > 2) top documents for each group in the top groups are retrieved. > > I thought that the collector generated by a RankQuery could be injected > in 2), i.e., for each group set a rerank collector... but I'm not sure if > this solution > is feasable since the collectors are set in Lucene > (AbstractSecondPassGroupingCollector) > and a RankQuery is defined in Solr... > > Any suggestion? > > Thanks, > Diego > > [1] https://cwiki.apache.org/confluence/display/solr/Result+Grouping > [2] https://cwiki.apache.org/confluence/display/solr/Query+Re-Ranking >
