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https://issues.apache.org/jira/browse/LUCENE-2504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12908357#action_12908357
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Yonik Seeley commented on LUCENE-2504:
--------------------------------------

I'm still seeing bad degredations in solr - I think it's because the default 
way for solr to sort strings is with MissingLastOrdComparator, which isn't 
specialized. I'll try and work up a patch based on Mike's work.

> sorting performance regression
> ------------------------------
>
>                 Key: LUCENE-2504
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2504
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 4.0
>            Reporter: Yonik Seeley
>             Fix For: 4.0
>
>         Attachments: LUCENE-2504.patch, LUCENE-2504.zip
>
>
> sorting can be much slower on trunk than branch_3x

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