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https://issues.apache.org/jira/browse/LUCENE-3972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252486#comment-13252486
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Dawid Weiss commented on LUCENE-3972:
-------------------------------------
Hmmm... it's not collisions then, it was worth a try. I still find the
difference puzzling -- I can't justify your version being 3x faster. Curious
what it might be.
bq. But we know a lot about docids, and extra hashing should just lead to an
average-case slowdown.
Ok.
> 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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