[jira] [Commented] (SOLR-8776) Support RankQuery in grouping

["Ahmet Anil Pala (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-8776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15301877#comment-15301877 ] 

Ahmet Anil Pala commented on SOLR-8776:
---------------------------------------

Hi,

Which branch is this patch compatible with? I've tried branch_6x and branch_6_0. Although, the patch was successfully applied, it prevented the source from compiling.

> 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
>
>
> 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+sTNQ@mail.gmail.com%3E
> [4] https://cwiki.apache.org/confluence/display/solr/Collapse+and+Expand+Results



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