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https://issues.apache.org/jira/browse/LUCENENET-415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13038562#comment-13038562
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Ben West commented on LUCENENET-415:
------------------------------------

Why do we need to know the size? Many IEnumerables don't expose a Count() 
method apart from iterating through the entire list. We could just make it lazy:

{code}
public long HitCount
{
   get { return _bitSet.Cardiality(); }
}           
{code} 

I'll try your other things.

> Contrib/Faceted Search
> ----------------------
>
>                 Key: LUCENENET-415
>                 URL: https://issues.apache.org/jira/browse/LUCENENET-415
>             Project: Lucene.Net
>          Issue Type: New Feature
>    Affects Versions: Lucene.Net 2.9.4
>            Reporter: Digy
>            Priority: Minor
>         Attachments: PerformanceTest.cs, PerformanceTest.cs, 
> PerformanceTest.cs, SimpleFacetedSearch.cs, SimpleFacetedSearch.cs, 
> SimpleFacetedSearch.cs, SimpleFacetedSearch.cs, TestSimpleFacetedSearch.cs, 
> TestSimpleFacetedSearch.cs, facet performance.xls, facet performance.xls
>
>
> Since I see a lot of questions about faceted search in these days, I plan to 
> add a Faceted-Search project to contrib.
> DIGY

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