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https://issues.apache.org/jira/browse/SOLR-2524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13037559#comment-13037559
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Michael McCandless commented on SOLR-2524:
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bq. Will this also be applied to 4.0 and the 3.2 branch?
So the current plan is to commit this issue only for 3.2.
Solr trunk already has its own grouping implementation, from which we've
factored out a shared grouping module (see LUCENE-1421). That module is
available in trunk and 3.x, but since Solr already has grouping in trunk, and
it has more features than the grouping module (specifically, that you can group
by docvalues derived from a function query and by arbitrary query), Solr trunk
will for now keep its own private impl.
Once we've factored out more stuff from Solr (function queries, LUCENE-2883,
and I think also filter caches) then we'll fix the grouping module and also
cutover Solr trunk to it. This is the current thinking anyway...
> Adding grouping to Solr 3x
> --------------------------
>
> Key: SOLR-2524
> URL: https://issues.apache.org/jira/browse/SOLR-2524
> Project: Solr
> Issue Type: New Feature
> Affects Versions: 3.2
> Reporter: Martijn van Groningen
> Assignee: Michael McCandless
> Attachments: SOLR-2524.patch, SOLR-2524.patch
>
>
> Grouping was recently added to Lucene 3x. See LUCENE-1421 for more
> information.
> I think it would be nice if we expose this functionality also to the Solr
> users that are bound to a 3.x version.
> The grouping feature added to Lucene is currently a subset of the
> functionality that Solr 4.0-trunk offers. Mainly it doesn't support grouping
> by function / query.
> The work involved getting the grouping contrib to work on Solr 3x is
> acceptable. I have it more or less running here. It supports the response
> format and request parameters (expect: group.query and group.func) described
> in the FieldCollapse page on the Solr wiki.
> I think it would be great if this is included in the Solr 3.2 release. Many
> people are using grouping as patch now and this would help them a lot. Any
> thoughts?
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