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https://issues.apache.org/jira/browse/SOLR-2524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13037778#comment-13037778
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Martijn van Groningen commented on SOLR-2524:
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Hi Hoss,
bq. is backporting what solr already uses on trunk to the 3x branch out of the
question?
Many folks have grouping like requirements. Nowadays they either have to use
the trunk or patch Solr. I think that having grouping in a released version
would be great.
bq. we had identical Solr tests (at the request api level) on trunk and 3x to
help sanity check that the two impls behave the same way
I copied the grouping test from trunk to 3x. Only the random tests are not
enabled. The general super test class (that other tests also use) is not
compatible between trunk and 3x.
bq. the folks working on the grouping refactoring felt confident that by the
time we get arround to releasing 4.0, the grouping refactoring would be at the
point that the 3.2 impl and the 4.0 impl would be equivalent.
I totally agree. I haven't opened a Solr issue yet, but I will do that soon.
Basically this new issue will be concerned with incorporating the grouping
module into Solr trunk without the loss of the current grouping functionality.
I think the at the time 4.0 is released the feature set Solr supports regarding
to grouping might be larger then what is in a previous 3.x release. We can keep
the response format and request parameters backward compatible.
> 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
>
>
> 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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