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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: field_collapsing.patch
This release is more conform with the semantics of "field collapsing".
Parameters are:
collapse=true // enable collapsing
collapse.field=[field] // indexed field used for collapsing
collapse.max=[integer] // Start collapsing after n document
collapse.type=[normal|adjacent] // Default value is "normal"
- "adjacent" collapse only consecutive documents.
- "normal" collapse all documents having equal collapsing field.
> 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
>
>
> 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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