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From "Yonik Seeley (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3972) Improve AllGroupsCollector implementations
Date Thu, 12 Apr 2012 14:49:18 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252469#comment-13252469
] 

Yonik Seeley commented on LUCENE-3972:
--------------------------------------

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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