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https://issues.apache.org/jira/browse/SOLR-5027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13780136#comment-13780136
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Joel Bernstein commented on SOLR-5027:
--------------------------------------
Simon,
Your idea sounds good and should be no problem to implement. When I finish up
the work on the Expand component I'll work on getting this in.
> Result Set Collapse and Expand Plugins
> --------------------------------------
>
> Key: SOLR-5027
> URL: https://issues.apache.org/jira/browse/SOLR-5027
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 5.0
> Reporter: Joel Bernstein
> Priority: Minor
> Attachments: SOLR-5027.patch, SOLR-5027.patch, SOLR-5027.patch,
> SOLR-5027.patch
>
>
> This ticket introduces two new Solr plugins, the *CollapsingQParserPlugin*
> and the *ExpandComponent*.
> The *CollapsingQParserPlugin* is a PostFilter that performs field collapsing.
> Collapse based on the highest scoring document:
> {code}
> fq=(!collapse field=<field_name>}
> {code}
> Collapse based on the min value of a numeric field:
> {code}
> fq={!collapse field=<field_name> min=<field_name>}
> {code}
> Collapse based on the max value of a numeric field:
> {code}
> fq={!collapse field=<field_name> max=<field_name>}
> {code}
> Collapse with a null policy:
> {code}
> fq={!collapse field=<field_name> nullPolicy=<null_policy>}
> {code}
> There are three null policies:
> ignore : removes docs with a null value in the collapse field (default).
> expand : treats each doc with a null value in the collapse field as a
> separate group.
> collapse : collapses all docs with a null value into a single group using
> either highest score, or min/max.
> The *ExpandComponent* is a search component that takes the collapsed docList
> and expands the groups for a single page based on parameters provided.
> Initial syntax:
> expand=true - Turns on the expand component.
> expand.field=<field> - Expands results for this field
> expand.limit=5 - Limits the documents for each expanded group.
> expand.sort=<sort spec> - The sort spec for the expanded documents. Default
> is score.
> expand.rows=500 - The max number of expanded results to bring back. Default
> is 500.
> *Note:* Recent patches don't contain the expand component. The July 16 patch
> does. This will be brought back in when the collapse is finished, or possible
> moved to it's own ticket.
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