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https://issues.apache.org/jira/browse/LUCENE-5425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13888213#comment-13888213
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John Wang commented on LUCENE-5425:
-----------------------------------

I realize if we make getting the docs abstract, to be useful, the set side also 
needs to be abstract. e.g. line 127
Let me add that to this patch.



> Make creation of FixedBitSet in FacetsCollector overridable
> -----------------------------------------------------------
>
>                 Key: LUCENE-5425
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5425
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/facet
>    Affects Versions: 4.6
>            Reporter: John Wang
>         Attachments: facetscollector.patch
>
>
> In FacetsCollector, creation of bits in MatchingDocs are allocated per query. 
> For large indexes where maxDocs are large creating a bitset of maxDoc bits 
> will be expensive and would great a lot of garbage.
> Attached patch is to allow for this allocation customizable while maintaining 
> current behavior.



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