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https://issues.apache.org/jira/browse/LUCENE-2504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12909272#action_12909272
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Yonik Seeley commented on LUCENE-2504:
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Looks like we're not using the correct comparators everywhere.
I was trying a slightly different way to implement sort-missing-last, and my
first comparator only implements setNextReader(), but I'm now getting many
UnsupportedOperationExceptions (i.e. the search process is using older
comparators after calling setNextReader())
One culprit is OneComparatorNonScoringCollector, and another is
OneComparatorFieldValueHitQueue I think.
> 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.patch, LUCENE-2504.zip
>
>
> sorting can be much slower on trunk than branch_3x
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