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Posted to dev@lucene.apache.org by "Adrien Grand (JIRA)" <ji...@apache.org> on 2013/05/03 17:56:17 UTC

[jira] [Resolved] (LUCENE-4946) Refactor SorterTemplate

     [ https://issues.apache.org/jira/browse/LUCENE-4946?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adrien Grand resolved LUCENE-4946.
----------------------------------

       Resolution: Fixed
    Fix Version/s: 4.4
    
> Refactor SorterTemplate
> -----------------------
>
>                 Key: LUCENE-4946
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4946
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Trivial
>             Fix For: 4.4
>
>         Attachments: LUCENE-4946.patch, LUCENE-4946.patch, LUCENE-4946.patch
>
>
> When working on TimSort (LUCENE-4839), I was a little frustrated of not being able to add galloping support because it would have required to add new primitive operations in addition to compare and swap.
> I started working on a prototype that uses inheritance to allow some sorting algorithms to rely on additional primitive operations. You can have a look at https://github.com/jpountz/sorts/tree/master/src/java/net/jpountz/sorts (but beware it is a prototype and still misses proper documentation and good tests).
> I think it would offer several advantages:
>  - no more need to implement setPivot and comparePivot when using in-place merge sort or insertion sort,
>  - the ability to use faster stable sorting algorithms at the cost of some memory overhead (our in-place merge sort is very slow),
>  - the ability to implement properly algorithms that are useful on specific datasets but require different primitive operations (such as TimSort for partially-sorted data).
> If you are interested in comparing these implementations with Arrays.sort, there is a Benchmark class in src/examples.
> What do you think?

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