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Posted to dev@lucene.apache.org by "Michael McCandless (Commented) (JIRA)" <ji...@apache.org> on 2012/04/12 11:57:19 UTC

[jira] [Commented] (LUCENE-3972) Improve AllGroupsCollector implementations

    [ https://issues.apache.org/jira/browse/LUCENE-3972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252315#comment-13252315 ] 

Michael McCandless commented on LUCENE-3972:
--------------------------------------------

Curious that it's so much faster ... BytesRefHash operates on the byte[] term while the current approach operates on int ord.

How large was the index?  If it was smallish, maybe the time was dominated by re-ord'ing after each reader...?
                
> 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
>
>
> 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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