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https://issues.apache.org/jira/browse/LUCENE-9542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17216661#comment-17216661
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Krishan commented on LUCENE-9542:
---------------------------------
Hey [~cpoerschke], This was happening on the LTR reranker when "sort" is
present in the request.
[http://localhost:8983/solr/techproducts/query?q=test&rq=%7B!ltr%20model=myModel%20reRankDocs=100%7D&fl=id,price,score,%5Bfeatures%5D&sort=price%20desc]
The features and models are provided from
[https://lucene.apache.org/solr/guide/6_6/learning-to-rank.html]
Unfortunately, I am not able to reproduce right now (so could have been a
different request structure) but I remember that if cmd.getSort() = null (which
happens when "sort" is absent in request) the score returned is the reranked
score. But if cmd.getSort() != null, the score returned is the original score.
Root cause looked to me that "query" variable is a boolean query where as
cmd.getQuery() is a type of RankQuery (and RankQuery is explicitly skipped in
this condition).
If this info is not enough, I can debug further to try to reproduce again and
provide exact query on the example data.
> Score returned in search request is original score and not reranked score
> -------------------------------------------------------------------------
>
> Key: LUCENE-9542
> URL: https://issues.apache.org/jira/browse/LUCENE-9542
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 8.0
> Reporter: Krishan
> Priority: Major
>
> Score returned in search request is original score and not reranked score
> post the changes in https://issues.apache.org/jira/browse/LUCENE-8412.
> Commit -
> [https://github.com/apache/lucene-solr/commit/55bfadbce115a825a75686fe0bfe71406bc3ee44#diff-4e354f104ed52bd7f620b0c05ae8467d]
> Specifically -
> if (cmd.getSort() != null && query instanceof RankQuery == false &&
> (cmd.getFlags() & GET_SCORES) != 0) {
> TopFieldCollector.populateScores(topDocs.scoreDocs, this, query);
> }
> in SolrIndexSearcher.java recomputes the score but outputs only the original
> score and not the reranked score.
>
> The issue is cmd.getQuery() is a type of RankQuery but the "query" variable
> is a boolean query and probably replacing query with cmd.getQuery() should be
> the right fix for this so that the score is not overriden for rerank queries
>
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