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https://issues.apache.org/jira/browse/SOLR-5027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13765381#comment-13765381
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Simon Endele commented on SOLR-5027:
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What do you mean exactly by "there is no concept of ngroups or group facets"?
Does that include that there will be no possibility to return the number of
groups, like the request parameter "group.ngroups" currently does?
Will it still be possible to decide if the faceting is done before/after
collapsing, similar to "group.facet"?
> 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
>
>
> This ticket introduces two new Solr plugins, the *CollapsingQParserPlugin*
> and the *ExpandComponent*.
> The *CollapsingQParserPlugin* is a PostFilter that performs field collapsing.
> This allows field collapsing to be done within the normal search flow.
> Initial syntax:
> fq=(!collapse field=<field_name>}
> All documents in a group will be collapsed to the highest ranking document in
> the group.
> 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.
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