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https://issues.apache.org/jira/browse/SOLR-5973?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Bernstein updated SOLR-5973:
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Description:
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=hello&rq={!customRank param1=a param2=b}&wt=json&indent=true
{code}
In the sample above the param: {code}rq={!customRank 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 the main query.
The RankQuery impl will have to do several things:
1) Implement the getTopDocsCollector() method to return a custom top docs
ranking collector.
2) Implement the wrap() method. The QueryComponent calls the wrap() method to
wrap the RankQuery around the main query. This design allows the RankQuery to
manage Query caching issues and implement custom Query explanations if needed.
3) Implement hashCode() and equals() so the queryResultCache works properly
with main query and custom ranking algorithm.
4) Optionally implement a custom MergeStrategy to handle the merging of
distributed results from the shards.
was:
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.
> 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,
> 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=hello&rq={!customRank param1=a param2=b}&wt=json&indent=true
> {code}
> In the sample above the param: {code}rq={!customRank 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
> the main query.
> The RankQuery impl will have to do several things:
> 1) Implement the getTopDocsCollector() method to return a custom top docs
> ranking collector.
> 2) Implement the wrap() method. The QueryComponent calls the wrap() method to
> wrap the RankQuery around the main query. This design allows the RankQuery to
> manage Query caching issues and implement custom Query explanations if needed.
> 3) Implement hashCode() and equals() so the queryResultCache works properly
> with main query and custom ranking algorithm.
> 4) Optionally implement a custom MergeStrategy to handle the merging of
> distributed results from the shards.
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