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https://issues.apache.org/jira/browse/SOLR-5973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13997975#comment-13997975
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ASF subversion and git services commented on SOLR-5973:
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Commit 1594698 from [~joel.bernstein] in branch 'dev/trunk'
[ https://svn.apache.org/r1594698 ]
SOLR-5973: Pluggable Ranking Collectors and Merge Strategies
> Pluggable Ranking Collectors and Merge Strategies
> -------------------------------------------------
>
> Key: SOLR-5973
> URL: https://issues.apache.org/jira/browse/SOLR-5973
> Project: Solr
> Issue Type: New Feature
> Components: search
> Reporter: Joel Bernstein
> Assignee: Joel Bernstein
> Priority: Minor
> Fix For: 4.9
>
> Attachments: SOLR-5973.patch, SOLR-5973.patch, SOLR-5973.patch,
> SOLR-5973.patch, SOLR-5973.patch, SOLR-5973.patch, SOLR-5973.patch,
> SOLR-5973.patch, SOLR-5973.patch, SOLR-5973.patch, SOLR-5973.patch,
> SOLR-5973.patch, SOLR-5973.patch, SOLR-5973.patch, SOLR-5973.patch
>
>
> This ticket introduces a new RankQuery and MergeStrategy to Solr. By
> extending the RankQuery class, and implementing it's interface, you can
> specify a custom ranking collector (TopDocsCollector) and distributed merge
> strategy for a Solr query.
> Sample syntax:
> {code}
> q={!customRank subquery=*:* param1=a param2=b}&wt=json&indent=true
> {code}
> In the sample above the param: {code}q={!customRank subquery=*:* param1=a
> param2=b}{code} points to a QParserPlugin that returns a Query that extends
> RankQuery. The RankQuery defines the custom ranking and merge strategy for
> it's subquery.
> The RankQuery impl will have to do several things:
> 1) Implement the RankQuery interface.
> 2) Wrap the subquery and proxy all calls to the Query interface to the
> subquery. Using local params syntax the subquery can be any valid Solr query.
> The custom QParserPlugin is responsible for parsing the subquery.
> 3) Implement hashCode() and equals() so the queryResultCache works properly
> with subquery and custom ranking algorithm.
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