[jira] [Created] (LUCENE-4839) Sorter API: Use TimSort to sort doc IDs and postings lists

["Adrien Grand (JIRA)" <ji...@apache.org>]

Adrien Grand created LUCENE-4839:
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             Summary: 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


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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