Hi Shai, the use case is simple. Suppose you want to buy an hi-fi on a online shop. Go in the website in the Electronic department and write "hi-fi" in the search box, the interface return you lots of results and a facet on brands (10 brands values). You select brand A and the results are filtered accordingly; suppose now you want to filter adding to the results the brand D, you can't because the filtered results by A don't contain values D for the brand facet.
Than how can I retrieve also the facets for the results not filtered? I think it's a common use case when you permit to the user to filter in OR by facets. Nicola. On Thu, 2013-01-24 at 19:36 +0200, Shai Erera wrote: > Hi Nicola, > > > Regarding the OR drill-down, yes you can construct your own > BooleanQuery, passing Occur.SHOULD instead of MUST. Currently > DrillDown does not help you do that, so you can copy the code from > DrillDown.query and change SHOULD to MUST. I opened LUCENE-4716 to add > this support to DrillDown. > > > > Not sure that I understand your second question. If you want to > retrieve counts for all descendants of A, then set your > FR.setNumResults to Integer.MAX_VALUE. But note, it's going to be > costly, i.e. you'd get a FacetResultNode per child of A, so depending > how "wide" A is, this may have some impact on RAM consumption. > > If that's not what you meant, could you please clarify? > > > Shai > > > > On Thu, Jan 24, 2013 at 7:22 PM, Nicola Buso <nb...@ebi.ac.uk> wrote: > Hi all, > > I'm introducing Lucene faceted search in our project and I > need some > hints to achieve some functionalities: > - I want facet filtering in OR, how to? > - obtain facets for the filtered results but also for the > non filtered > one. i.e. I have facet A with values A/V1, A/V2, A/V3 and > these values > are disjunct each other, than a document having field with > value V1 > can't have also value V2 and so on; I would like to let the > user select > more of these facet values in OR; how can I accumulate all the > facets > values also filtering by facet selection? Should it work in a > way > similar to ComplementCountingAggregator? > - Can I use DrillDown class to obtain the OR facet filtering > or have I > to rewrite a similar class using the BooleanQuery in OR. It's > not clear > to me by this comment in the API: > Wraps a given Query as a drill-down query over the given > categories, > assuming all are required (e.g. AND). You can construct a > query with > different modes (such as OR or AND of ORs) by creating a > BooleanQuery > and call this method several times. Make sure to wrap the > query in that > case by ConstantScoreQuery and set the boost to 0.0f, so that > it doesn't > affect scoring. > > > Do you have any examples doing this? > > Regards > > Nicola. > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: > java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: > java-user-h...@lucene.apache.org > > > --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
