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https://issues.apache.org/jira/browse/SOLR-2524?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martijn van Groningen updated SOLR-2524:
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Attachment: SOLR-2524.patch
Updated patch to what is created in SOLR-2564. The only difference is that when
grouping by field (group.field) and the field isn't a string field (String,
TextField or another that can produce a StringIndex from fieldcache) then a
SolrException is thrown indicating that grouping on that field is not
supported. This is to prevent double cache usage.
I think it is time to commit this patch!
> Adding grouping to Solr 3x
> --------------------------
>
> Key: SOLR-2524
> URL: https://issues.apache.org/jira/browse/SOLR-2524
> Project: Solr
> Issue Type: New Feature
> Reporter: Martijn van Groningen
> Assignee: Michael McCandless
> Fix For: 3.3
>
> Attachments: SOLR-2524.patch, SOLR-2524.patch, 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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