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https://issues.apache.org/jira/browse/LUCENE-2504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12908519#action_12908519
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Yonik Seeley commented on LUCENE-2504:
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Hmmm, turns out the sorting bug I just checked in (r996332) has been around a
bit longer than I thought - since field cache was converted to bytes on
6/3/2010 (LUCENE-2380).
So anyone using trunk since then and sorting on string fields with null values
may want to upgrade.
> 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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