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Date: Thu, 22 Sep 2011 10:10:28 +0200
From: Em <mailformailinglists@yahoo.de>
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To: java-user@lucene.apache.org
Subject: Re: FacetedSearch DrillDown
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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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