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https://issues.apache.org/jira/browse/LUCENE-3972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252469#comment-13252469
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Yonik Seeley commented on LUCENE-3972:
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bq. I would also patch it for the future in either case.
Hmmm, if you don't know anything about the integer keys, then a little extra
hashing by default is a good idea.
But we know a lot about docids, and extra hashing should just lead to an
average-case slowdown.
> 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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