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https://issues.apache.org/jira/browse/LUCENE-4839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13604283#comment-13604283
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Uwe Schindler edited comment on LUCENE-4839 at 3/16/13 3:03 PM:
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Nice! Why do we need the private inner class TimSort?
I would be happy to also add the timSort algorithm to ArrayUtils and
CollectionUtils. Its just adding some convenience methods using the already
existing SorterTemplates for arrays and collections.
The bonus would be: The extensive random tests in TestArrayUtils and
TestCollectionUtils could be used for timSort, too (their existence is the
reason why there is no TestSorterTemplate class in current code).
was (Author: thetaphi):
Nice! Why do we need the private inner class TimSort?
I would be happy to also add the timSort algorithm to ArrayUtils and
CollectionUtils. Its just adding some convenience methods using the already
existing SorterTemplates for arrays and collections.
> 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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