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https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12501557
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Yonik Seeley commented on SOLR-236:
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Will Johnson brings up other use-cases:
[...]
> it's also heavily used in
> ecommerce settings. Check out BestBuy.com/circuitcity/etc and do a
> search for some really generic word like 'cable' and notice all the
> groups of items; BB shows 3 per group, CC shows 1 per group. In each
> case it's not clear that the number of docs is really limited at all, ie
> it's more important to get back all the categories with n docs per
> category and the counts per category than it is to get back a fixed
> number of results or even categories for that matter. Also notice that
> neither of these sites allow you to page through the categorized
> results.
Some of this seems very closely related to faceted search, and much of it could
be implemented that way now on the client side, but it would take multiple
queries to do so.
One could also think about supporting multi-valued fields in the same manner
that faceting does.
> Field collapsing
> ----------------
>
> Key: SOLR-236
> URL: https://issues.apache.org/jira/browse/SOLR-236
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 1.2
> Reporter: Emmanuel Keller
> Attachments: field_collapsing_1.1.0.patch,
> SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch
>
>
> This patch include a new feature called "Field collapsing".
> "Used in order to collapse a group of results with similar value for a given
> field to a single entry in the result set. Site collapsing is a special case
> of this, where all results for a given web site is collapsed into one or two
> entries in the result set, typically with an associated "more documents from
> this site" link. See also Duplicate detection."
> http://www.fastsearch.com/glossary.aspx?m=48&amid=299
> The implementation add 3 new query parameters (SolrParams):
> "collapse.field" to choose the field used to group results
> "collapse.type" normal (default value) or adjacent
> "collapse.max" to select how many continuous results are allowed before
> collapsing
> TODO (in progress):
> - More documentation (on source code)
> - Test cases
> Two patches:
> - "field_collapsing.patch" for current development version (1.2)
> - "field_collapsing_1.1.0.patch" for Solr-1.1.0
> P.S.: Feedback and misspelling correction are welcome ;-)
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