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https://issues.apache.org/jira/browse/LUCENE-4839?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand resolved LUCENE-4839.
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Resolution: Fixed
> Sorter API: Use TimSort to sort doc IDs and postings lists
> ----------------------------------------------------------
>
> Key: LUCENE-4839
> URL: https://issues.apache.org/jira/browse/LUCENE-4839
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-4839.patch, LUCENE-4839.patch
>
>
> TimSort (http://svn.python.org/projects/python/trunk/Objects/listsort.txt,
> used by python and Java's Arrays.sort(Object[]) in particular) is a sorting
> algorithm that performs very well on partially-sorted data. Indeed, with
> TimSort, sorting an array which is in reverse order or a finite concatenation
> of sorted arrays is a linear operation (instead of O(n ln(n))).
> The sorter API could benefit from this algorithm when using
> Sorter.REVERSE_DOCS or merging several sorted readers for example.
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