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https://issues.apache.org/jira/browse/LUCENE-4893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13618088#comment-13618088
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Michael McCandless commented on LUCENE-4893:
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I think we should throw an exception if you call it again? It's trappy that it
silently returns double-counts I think.
> Facet counts in FacetsAccumulator.facetArrays are multiplied as many times as
> FacetCollector.getFacetResults is called.
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-4893
> URL: https://issues.apache.org/jira/browse/LUCENE-4893
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/facet
> Affects Versions: 4.2
> Reporter: crocket
>
> In lucene 4.1, only StandardFacetsAccumulator could be instantiated.
> And as of lucene 4.2, it became possible to instantiate FacetsAccumulator.
> I invoked FacetCollector.getFacetResults twice, and I saw doubled facet
> counts.
> If I invoke it three times, I see facet counts multiplied three times.
> It all happens in FacetsAccumulator.accumulate.
> StandardFacetsAccumulator doesn't have this bug since it frees facetArrays
> whenever StandardFacetsAccumulator.accumulate is called.
> Is it a feature or a bug?
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