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From "Diego Ceccarelli (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-8776) Support RankQuery in grouping
Date Mon, 13 May 2019 22:02:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-8776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16838896#comment-16838896
] 

Diego Ceccarelli commented on SOLR-8776:
----------------------------------------

[~ichattopadhyaya] are you still interested in moving this forward? It is really very painful
to update it upstream when it gets stale :D 

> 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 10m
>  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+sTNQ@mail.gmail.com%3E
> [4] https://cwiki.apache.org/confluence/display/solr/Collapse+and+Expand+Results



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