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https://issues.apache.org/jira/browse/SOLR-5027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13705779#comment-13705779
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Joel Bernstein commented on SOLR-5027:
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This is an alternative for field collapsing. It only collapses the groups. This
is the first step of moving grouping into the main search flow. The second step
is to create a separate search component that works with the collapsed doclist
and expands the groups for a single page. The two combined would be a
replacement for the current grouping functionality.
With this approach to field collapsing the main doclist/docset are collapsed.
So there is no concept of ngroups or group facets. The result count and facet
counts automatically line up with the collapsed doclist/docset.
The query result cache was commented out for performance testing only. In later
patches I'll leave this 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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