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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