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https://issues.apache.org/jira/browse/LUCENE-6293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14336300#comment-14336300
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Adrien Grand commented on LUCENE-6293:
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Given the description of the problem, I think we suffer from it too. However
when I tried the test code with Lucene's ArrayUtil.timSort instead of Java's
Arrays.sort I could not reproduce the problem. I suspect this is due to some
differences in implementation details... I'll try to dig more.
> TimSort bug
> -----------
>
> Key: LUCENE-6293
> URL: https://issues.apache.org/jira/browse/LUCENE-6293
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
>
> Robert pointed me to
> http://envisage-project.eu/proving-android-java-and-python-sorting-algorithm-is-broken-and-how-to-fix-it/
> yesterday which explains how most implementations of TimSort are broken. We
> should check our TimSorter.
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