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https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Emmanuel Keller updated SOLR-236:
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Attachment: SOLR-236-FieldCollapsing.patch
Sorry, my last post was buggy. Here is the correct one. There is no more
exception now.
About tokens, if any token matches within the field it will collapse.
When I start implementing collapsing, my need was to to group documents having
exact identical field.
I believe that faceting has identical behavior. Lookt at "Graphic card" as
example:
http://localhost:8983/solr/select/?q=cat:graphic%20card&version=2.2&start=0&rows=10&indent=on&facet=true&facet.field=cat
I will try to maintain the wiki page.
> 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: collapse_field.patch, collapse_field.patch,
> field_collapsing.patch, field_collapsing.patch, field_collapsing.patch,
> field_collapsing_1.1.0.patch, SOLR-236-FieldCollapsing.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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