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https://issues.apache.org/jira/browse/LUCENE-1421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13033509#comment-13033509
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Robert Muir commented on LUCENE-1421:
-------------------------------------
Hi Martijn, in 3.x it is available as a lucene contrib (contrib/grouping).
As far as classes being package-private, I don't think Mike intended this, as
they are marked experimental.
Want to upload a patch that ensures everything you need has correct visibility?
> Ability to group search results by field
> ----------------------------------------
>
> Key: LUCENE-1421
> URL: https://issues.apache.org/jira/browse/LUCENE-1421
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Search
> Reporter: Artyom Sokolov
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 3.2, 4.0
>
> Attachments: LUCENE-1421.patch, LUCENE-1421.patch,
> lucene-grouping.patch
>
>
> It would be awesome to group search results by specified field. Some
> functionality was provided for Apache Solr but I think it should be done in
> Core Lucene. There could be some useful information like total hits about
> collapsed data like total count and so on.
> Thanks,
> Artyom
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