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https://issues.apache.org/jira/browse/SOLR-8776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15193892#comment-15193892
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Diego Ceccarelli commented on SOLR-8776:
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Update: I found a way to change the behavior of the collectors without moving
RankQuery into Lucene. This new patch performs the group reranking without
changing Lucene. The only difference is that if the Query is a RankQuery
instead of using {{TermSecondPassGroupingCollector}} I'll use a
{{RerankTermSecondPassGroupingCollector}}. The new collector will scan the
groups collectors and wrap them in 'rerank collectors':
{code:java}
for (SearchGroup<BytesRef> group : groups) {
if (query != null) {
collector = groupMap.get(group.groupValue).collector;
collector = query.getTopDocsCollector(collector, groupSort, searcher);
groupMap.put(group.groupValue, new
SearchGroupDocs<BytesRef>(group.groupValue, collector));
}
}
{code}
> 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
>
> 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+s...@mail.gmail.com%3E
> [4]
> https://cwiki.apache.org/confluence/display/solr/Collapse+and+Expand+Results
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