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Date: Wed, 19 Oct 2011 09:10:11 +0000 (UTC)
From: "Li Fanxi (Commented) (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Commented] (SOLR-792) Pivot (ie: Decision Tree) Faceting
 Component
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    [ https://issues.apache.org/jira/browse/SOLR-792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13130461#comment-13130461 ] 

Li Fanxi commented on SOLR-792:
-------------------------------

I have a question about facet.pivot.mincount. Does this parameter defined as the limitation for "minimum number of documents" that should be included in the result? 

In the current implementation, I found that this parameter also takes effect for the number of facets fields, caused by the following code in doPivots function: 

{code}
    NamedList<Integer> nl = sf.getTermCounts(subField);
    if (nl.size() >= minMatch ) {
        pivot.add( "pivot", doPivots( nl, subField, nextField, fnames, rb, subset, minMatch ) );
        values.add( pivot ); // only add response if there are some counts
    }
{code} 

I don't understand why we need to compare minMatch to nl.size().

With this code, if we do pivot faceting on the fields "cat,manu_id_s", when cat='electronics' and we have 50 documents distributed in 3 different "manu_id_s". If we limit the result with facet.pivot.mincount=5, no result will be returned, because there are only 3 different "manu_id_s". Is this the desired behavior for the "facet.pivot.mincount" parameter?
                
> Pivot (ie: Decision Tree) Faceting Component
> --------------------------------------------
>
>                 Key: SOLR-792
>                 URL: https://issues.apache.org/jira/browse/SOLR-792
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Erik Hatcher
>            Assignee: Yonik Seeley
>            Priority: Minor
>         Attachments: SOLR-792-PivotFaceting.patch, SOLR-792-PivotFaceting.patch, SOLR-792-PivotFaceting.patch, SOLR-792-PivotFaceting.patch, SOLR-792-as-helper-class.patch, SOLR-792-distributed.patch, SOLR-792-raw-type.patch, SOLR-792.patch, SOLR-792.patch, SOLR-792.patch, SOLR-792.patch, SOLR-792.patch, SOLR-792.patch, SOLR-792.patch
>
>
> A component to do multi-level faceting.

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