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https://issues.apache.org/jira/browse/LUCENE-5425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13888464#comment-13888464
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Lei Wang commented on LUCENE-5425:
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And, the idea of keep the DocIdSet a raw DocIdSet is quite good. For the 
collecting part, we can have a wrapper, which can return a DocIdSet after the 
collecting is done.

> 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, 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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