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https://issues.apache.org/jira/browse/SOLR-5027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13806373#comment-13806373
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Shawn Heisey commented on SOLR-5027:
------------------------------------
[~er.shruti], the following commands will use SVN to check out the 4.5.1 source
code and apply the commits for this issue to it. You must have subversion (1.7
or later preferred) on your computer already:
{noformat}
svn co https://svn.apache.org/repos/asf/lucene/dev/tags/lucene_solr_4_5_1
cd lucene_solr_4_5_1/
svn merge --accept postpone -c 1535208
https://svn.apache.org/repos/asf/lucene/dev/trunk
svn merge -c 1535614 https://svn.apache.org/repos/asf/lucene/dev/trunk
{noformat}
There is one merge conflict that cannot be automatically resolved, but it is on
CHANGES.txt, which is not required for the patch to operate. The '--accept
postpone' argument that I have put on the first merge command will cause this
to be skipped.
We strongly recommend running 4.5.1, not 4.5.0, because there are a number of
critical bugs that have been fixed.
> Field Collapsing PostFilter
> ---------------------------
>
> 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
> Assignee: Joel Bernstein
> Priority: Minor
> Fix For: 4.6, 5.0
>
> Attachments: SOLR-5027.patch, SOLR-5027.patch, SOLR-5027.patch,
> SOLR-5027.patch, SOLR-5027.patch, SOLR-5027.patch, SOLR-5027.patch,
> SOLR-5027.patch, SOLR-5027.patch
>
>
> This ticket introduces the *CollapsingQParserPlugin*
> The *CollapsingQParserPlugin* is a PostFilter that performs field collapsing.
> This is a high performance alternative to standard Solr field collapsing
> (with *ngroups*) when the number of distinct groups in the result set is high.
> For example in one performance test, a search with 10 million full results
> and 1 million collapsed groups:
> Standard grouping with ngroups : 17 seconds.
> CollapsingQParserPlugin: 300 milli-seconds.
> Sample syntax:
> 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 CollapsingQParserPlugin also fully supports the QueryElevationComponent
> *Note:* The July 16 patch also includes and ExpandComponent that expands the
> collapsed groups for the current search result page. This functionality will
> be moved to it's own ticket.
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