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https://issues.apache.org/jira/browse/LUCENE-3972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252437#comment-13252437
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Martijn van Groningen commented on LUCENE-3972:
-----------------------------------------------

Dawid - Do you mean the hash method instead of rehash method in SentinelIntSet? 
The rehash methods doesn't have any parameters. 
                
> Improve AllGroupsCollector implementations
> ------------------------------------------
>
>                 Key: LUCENE-3972
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3972
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: modules/grouping
>            Reporter: Martijn van Groningen
>         Attachments: LUCENE-3972.patch, LUCENE-3972.patch
>
>
> I think that the performance of TermAllGroupsCollectorm, 
> DVAllGroupsCollector.BR and DVAllGroupsCollector.SortedBR can be improved by 
> using BytesRefHash to store the groups instead of an ArrayList.

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