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From "Uwe Schindler (JIRA)" <>
Subject [jira] [Commented] (LUCENE-4839) Sorter API: Use TimSort to sort doc IDs and postings lists
Date Sat, 16 Mar 2013 14:50:13 GMT


Uwe Schindler commented on LUCENE-4839:

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:
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>         Attachments: LUCENE-4839.patch
> TimSort (, 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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