[jira] [Commented] (LUCENE-5312) Block-join-friendly index sorting

["Robert Muir (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-5312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13808114#comment-13808114 ] 

Robert Muir commented on LUCENE-5312:
-------------------------------------

Seems fine to me. As far as the future, I am worried about the API :)

I think we should decide if the central class should be DocComparator or Sorter and adjust our APIs appropriately: e.g. with the patch its not easy to just sort on a NDV field with block joins, but I feel like it should be.

But as a start, lets do this first and see if we can reorganize.

> 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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