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https://issues.apache.org/jira/browse/LUCENE-1421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13033525#comment-13033525
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Martijn van Groningen commented on LUCENE-1421:
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bq. Want to upload a patch that ensures everything you need has correct
visibility?
Only the SearchGroup class had different visibility compared to the patch. And
Michael says he is going to change that. So I think a patch for that is a bit
overkill.
bq. Yes, I ported to 3.x as contrib/grouping, so this will be released when we
release 3.2.
Cool! After a svn update I see the contrib now as well.
The question is how to go from here. Continue development in this issue or for
each new grouping related feature a separate issue?
E.g. think about class hierarchy / strategy for grouping collectors. And new
collectors like UniqueFieldValueCountGroupCollector.
I haven't see an issue regarding post faceting yet. I can create one if
necessary?
> 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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