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https://issues.apache.org/jira/browse/LUCENE-5312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13808161#comment-13808161
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Adrien Grand commented on LUCENE-5312:
--------------------------------------

Good point, I was having a very similar thought when writing the patch. I 
opened an issue: LUCENE-5314



> Block-join-friendly index sorting
> ---------------------------------
>
>                 Key: LUCENE-5312
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5312
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/other
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>         Attachments: LUCENE-5312.patch
>
>
> It could be useful to have a block-join-friendly sorter implementation that 
> doesn't break index-time blocks:
>  - blocks must not interleave,
>  - parents must remain at the end of the blocks



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