[jira] [Resolved] (SOLR-7689) ReRankQuery rewrite method can change the QueryResultKey causing cache misses.

["Joel Bernstein (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-7689?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joel Bernstein resolved SOLR-7689.
----------------------------------
    Resolution: Fixed

> ReRankQuery rewrite method can change the QueryResultKey causing cache misses.
> ------------------------------------------------------------------------------
>
>                 Key: SOLR-7689
>                 URL: https://issues.apache.org/jira/browse/SOLR-7689
>             Project: Solr
>          Issue Type: Bug
>          Components: search, SearchComponents - other
>            Reporter: Emad Nashed
>            Assignee: Joel Bernstein
>             Fix For: Trunk, 5.2.2
>
>         Attachments: SOLR-7689.patch, SOLR-7689.patch, SOLR-7689.patch, SOLR-7689.patch, SOLR-7689.patch
>
>
> In SolrIndexSearcher class, the key used to lookup results in queryResultCache uses the original query. 
> However later in createNormalizedWeight the query gets re-written, and then saved in the queryResultCache after it's re-written. 
> This causes cache misses for the same query, and un-necessary inserts in the queryResultCache.
> I can reproduce this using a re-ranking query that is using a main query as a dismax query, the dismax Query could be re-written into a TermQuery, which makes sense, but will cause cache misses.
> I tested a quick solution by just using q.clone()  when it comes to build QueryResultKey, and it works fine, but not sure if that is the best way of doing it.



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