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From Shai Erera <ser...@gmail.com>
Subject Re: FacetedSearch DrillDown
Date Thu, 22 Sep 2011 08:14:34 GMT
Hi

The link to the facet javadocs was not added to the release artifacts by
mistake, however they do exist in this URL:
http://lucene.apache.org/java/3_4_0/api/contrib-facet/index.html.

I've already fixed it, so in the next release it should be ok.

Shai

On Thu, Sep 22, 2011 at 11:10 AM, Em <mailformailinglists@yahoo.de> wrote:

> Hi,
>
> I just saw that this is about Lucene, not Solr. So I am sorry for giving
> a Solr-advice on a Lucene-topic.
>
> Shai, I just found the Facet-Contribution's API via Google. Where are
> references to that API? I can not find them in Lucene's Wiki or at the
> Lucene-page.
>
> I'd like to read a little bit more about this contribution to compare it
> with existing approaches in Solr.
>
> Thanks!
> Em
>
> Am 22.09.2011 09:08, schrieb Shai Erera:
> > Hi Mihai,
> >
> > thanks for clarifying the question. The facet module supports that quite
> > easily actually. I've included a sample code with some description:
> >
> > (1) FacetSearchParams fsp = new FacetSearchParams();
> > (2) CountFacetRequest facetRequest = new CountFacetRequest(new
> > CategoryPath("monday"), 10);
> > (3) facetRequest.setDepth(3);
> > (4) fsp.addFacetRequest(facetRequest);
> > (5) FacetsCollector col = new FacetsCollector(fsp,
> > searcher.getIndexReader(), taxoReader);
> > (6) searcher.search(new MatchAllDocsQuery(), col);
> > (7) System.out.println(col.getFacetResults().get(0));
> >
> > Explanation:
> > (1) -- create FacetSearchParams with the default FacetIndexingParams.
> This
> > is the common case.
> > (2) -- Create CountFacetRequest, for the 'monday' node (which is the
> > top-level node in your example), and specify that the top-10 counted
> > categories should be returned.
> > (3) -- Specify depth=3, which means that the top-K (10 in this example)
> > should be computed among all nodes up to depth '3'.
> > (4) -- add the FacetRequest to the search params.
> > (5) -- Create the FacetsCollector
> > (6) -- Issue the search
> > (7) -- Print the result, in this case only one FacetResult exists because
> > only one dimension (FacetRequest) was asked.
> >
> > This prints the following:
> >
> > Request: monday nRes=10 nLbl=10
> > Num valid Descendants (up to specified depth): 5
> >     Facet Result Node with 5 sub result nodes.
> >     Name: monday
> >     Value: 3.0
> >     Residue: 0.0
> >
> >     Subresult #0
> >         Facet Result Node with 0 sub result nodes.
> >         Name: monday/1pm
> >         Value: 2.0
> >         Residue: 0.0
> >
> >     Subresult #1
> >         Facet Result Node with 0 sub result nodes.
> >         Name: monday/2pm/3min
> >         Value: 1.0
> >         Residue: 0.0
> >
> >     Subresult #2
> >         Facet Result Node with 0 sub result nodes.
> >         Name: monday/2pm
> >         Value: 1.0
> >         Residue: 0.0
> >
> >     Subresult #3
> >         Facet Result Node with 0 sub result nodes.
> >         Name: monday/1pm/4min
> >         Value: 1.0
> >         Residue: 0.0
> >
> >     Subresult #4
> >         Facet Result Node with 0 sub result nodes.
> >         Name: monday/1pm/3min
> >         Value: 1.0
> >         Residue: 0.0
> >
> > I believe that's what you were looking for?
> >
> > The DrillDown class provide helper utility methods for drilling-down on a
> > selected facet. I.e., if you return the user the above results, and he
> > clicks on "Monday/1pm", you want to constraint the search to this
> category
> > only. The DrillDown class helps you create a Query out of the user's
> > selection.
> >
> > We wrote a very extensive userguide which unfortunately didn't make it
> into
> > the release. I've attached its PDF version in this issue:
> > https://issues.apache.org/jira/browse/LUCENE-3261. I intend to make an
> HTML
> > version out of it, so that it will be included with future releases.
> > Apologies for the delay.
> >
> > Shai
> >
> > On Wed, Sep 21, 2011 at 10:44 PM, Mihai Caraman <caraman.mihai@gmail.com
> >wrote:
> >
> >> monday, 1pm,  3min
> >
>
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