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Date: Sat, 16 Mar 2013 14:54:12 +0000 (UTC)
From: "Yonik Seeley (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Message-ID: <JIRA.12637377.1363443540878.452116.1363445652847@arcas>
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Subject: [jira] [Commented] (LUCENE-4839) Sorter API: Use TimSort to sort
 doc IDs and postings lists
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    [ https://issues.apache.org/jira/browse/LUCENE-4839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13604285#comment-13604285 ] 

Yonik Seeley commented on LUCENE-4839:
--------------------------------------

Sweet!
Extra nostalgia points - I remember when timsort was put into python.  I hadn't realized that Java7's object sorting was based on it though.
                
> 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
>
>
> 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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