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https://issues.apache.org/jira/browse/SOLR-5027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13705899#comment-13705899
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Joel Bernstein commented on SOLR-5027:
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It should perform much better then the combination of ngroups and group facets,
which have a pretty steep performance penalty as ngroups rises. More testing is
needed though to see how this plays out.
> CollapsingQParserPlugin
> -----------------------
>
> 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
>
>
> 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.
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