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https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12501579
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Yonik Seeley commented on SOLR-236:
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> The sorting is not modified. I copy the current sort to do a new search.
Perhaps if you outlined the algorithm you use, it would clear up some things.
It looks like you make a copy of the Sort and insert a primary sort on the
field to be collapsed, and then process the same way as you would for the
"ADJACENT" option. If the original sort was by relevance, this doesn't give
you the groups sorted by relevance, right?
> 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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