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https://issues.apache.org/jira/browse/SOLR-8776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15953586#comment-15953586
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Diego Ceccarelli commented on SOLR-8776:
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Hi all, I updated the PR (https://github.com/apache/lucene-solr/pull/162) now
it supports reranking by field and by function query, and reranking by field in
distribute setting - I have working tests for all the use cases.
There are still some details to fix:
* I had to remove final from {{GroupDocs::maxScore}} and {{GroupDocs::score}}
(I can easily fix this I think)
* {{Rerank(Function|Group)SecondPassGroupingCollector}} have the number of
documents to rerank hardcoded in the class because {{RankQuery}} doesn't expose
that value (I think it should)
[~joel.bernstein], [~martijn.v.groningen], [~romseygeek] any feedback?
> Support RankQuery in grouping
> -----------------------------
>
> Key: SOLR-8776
> URL: https://issues.apache.org/jira/browse/SOLR-8776
> Project: Solr
> Issue Type: Improvement
> Components: search
> Affects Versions: 6.0
> Reporter: Diego Ceccarelli
> Priority: Minor
> Fix For: 6.0
>
> Attachments: 0001-SOLR-8776-Support-RankQuery-in-grouping.patch,
> 0001-SOLR-8776-Support-RankQuery-in-grouping.patch,
> 0001-SOLR-8776-Support-RankQuery-in-grouping.patch,
> 0001-SOLR-8776-Support-RankQuery-in-grouping.patch,
> 0001-SOLR-8776-Support-RankQuery-in-grouping.patch
>
>
> Currently it is not possible to use RankQuery [1] and Grouping [2] together
> (see also [3]). In some situations Grouping can be replaced by Collapse and
> Expand Results [4] (that supports reranking), but i) collapse cannot
> guarantee that at least a minimum number of groups will be returned for a
> query, and ii) in the Solr Cloud setting you will have constraints on how to
> partition the documents among the shards.
> I'm going to start working on supporting RankQuery in grouping. I'll start
> attaching a patch with a test that fails because grouping does not support
> the rank query and then I'll try to fix the problem, starting from the non
> distributed setting (GroupingSearch).
> My feeling is that since grouping is mostly performed by Lucene, RankQuery
> should be refactored and moved (or partially moved) there.
> Any feedback is welcome.
> [1] https://cwiki.apache.org/confluence/display/solr/RankQuery+API
> [2] https://cwiki.apache.org/confluence/display/solr/Result+Grouping
> [3]
> http://mail-archives.apache.org/mod_mbox/lucene-solr-user/201507.mbox/%3ccahm-lpuvspest-sw63_8a6gt-wor6ds_t_nb2rope93e4+s...@mail.gmail.com%3E
> [4]
> https://cwiki.apache.org/confluence/display/solr/Collapse+and+Expand+Results
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