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https://issues.apache.org/jira/browse/SOLR-8776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15175817#comment-15175817
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Joel Bernstein commented on SOLR-8776:
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Moving the RankQuery into Lucene is a showstopper I believe because of the
MergeStrategy which is very specific to how Solr merges documents from the
shards.
There are portions of the grouping code in Solr. It might be best to first
start looking to see if you can get the RankQuery added on the Solr side.
> 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: master
> Reporter: Diego Ceccarelli
> Priority: Minor
> Fix For: master
>
>
> 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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