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https://issues.apache.org/jira/browse/SOLR-8776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17046493#comment-17046493
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Diego Ceccarelli commented on SOLR-8776:
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Hi all, I'm still fresh on solr grouping code in master, and I'll be happy to
do the work to fix this, if a committer can help me. I would also be happy to
throw away the current PR and plan fresh work to fix the issue (I have to admit
that the current PR Is hard to review and it might be split in different PRs).
Please if anyone is interested in fixing this issue let me know :).
> 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
> 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
>
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> 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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