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https://issues.apache.org/jira/browse/SOLR-2524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13037745#comment-13037745
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Hoss Man commented on SOLR-2524:
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bq. 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.
FWIW: I'm a little wary of the idea that we might wind up with an alternate
approach to the "grouping" functionality released in 3.2 then what would then
later be released in 4.0 ... i haven't looked at the approach in branch enough
to understand how they differ, but i'm concerned about the hypothetical
possibilities that they might have subtly differnet behavior in edge cases, or
different perf characteristics, or that 3.2 might add a feature that is hard to
support in 4.0, etc....
I say this only to raise it as a red flag to watch out for -- not because i
want to stop the progress on this issue.
The first question that sprang to mind when i saw this issue was: is
backporting what solr already uses on trunk to the 3x branch out of the
question?
assuming it is, then i guess the main thing that would help ease my fears are
if:
1) 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
2) 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.
> 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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