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https://issues.apache.org/jira/browse/SOLR-237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12495285
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Ryan McKinley commented on SOLR-237:
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can you make a patch off:
http://svn.apache.org/repos/asf/lucene/solr/trunk/
thanks
> Field collapsing
> ----------------
>
> Key: SOLR-237
> URL: https://issues.apache.org/jira/browse/SOLR-237
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 1.1.0
> Reporter: Emmanuel Keller
> Attachments: field_collapsing-1.1.patch, field_collapsing_1.1.0.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" set to true to enable collapsing.
> "collapse.field" to choose the field used to group results
> "collapse.max" to select how many continuous results are allowed before
> collapsing
> TODO (in progress):
> - More documentation (on source code)
> - Test cases
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