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https://issues.apache.org/jira/browse/LUCENE-4875?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand resolved LUCENE-4875.
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Resolution: Fixed
> Make SorterTemplate.mergeSort run in linear time on sorted arrays
> -----------------------------------------------------------------
>
> Key: LUCENE-4875
> URL: https://issues.apache.org/jira/browse/LUCENE-4875
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Trivial
> Fix For: 4.3
>
> Attachments: LUCENE-4875.patch
>
>
> Through minor modifications, SorterTemplate.mergeSort could run in linear
> time on sorted arrays, so I think we should do it? The idea is to modify
> merge so that it returns instantly when compare(pivot-1, pivot) <= 0.
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