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https://issues.apache.org/jira/browse/SOLR-2524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13039446#comment-13039446
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Michael McCandless commented on SOLR-2524:
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Right -- the grouping module today always uses StringIndex/DocTermsIndex from
the FC.
But once LUCENE-3099 is in, Solr can subclass the collectors and use
MutableValue which pulls the "right" (typed according to the schema) entry from
FC, so we can avoid the FC insanity.
We need LUCENE-3099 anyway to be able to group by FQ (and thus cutover Solr
trunk to grouping module too)....
> 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, 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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