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Posted to dev@lucene.apache.org by "Adrien Grand (JIRA)" <ji...@apache.org> on 2013/03/16 15:38:12 UTC
[jira] [Updated] (LUCENE-4839) Sorter API: Use TimSort to sort doc
IDs and postings lists
[ https://issues.apache.org/jira/browse/LUCENE-4839?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Adrien Grand updated LUCENE-4839:
---------------------------------
Attachment: LUCENE-4839.patch
bq. If you want to port TimSort to Lucene, would it be possible to do it based on SorterTemplate?
Here it is. :-)
> 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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