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https://issues.apache.org/jira/browse/SOLR-14765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17646197#comment-17646197
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Michael Gibney commented on SOLR-14765:
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oh no; very likely. Looking into this now.
> optimize DocList creation by skipping sort for sort-irrelevant cases
> --------------------------------------------------------------------
>
> Key: SOLR-14765
> URL: https://issues.apache.org/jira/browse/SOLR-14765
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 9.0
> Reporter: Michael Gibney
> Assignee: Michael Gibney
> Priority: Major
> Fix For: 9.1
>
> Attachments: SOLR-16585-reproducer.patch
>
> Time Spent: 14h
> Remaining Estimate: 0h
>
> When {{rows=0}}, and for {{MatchAllDocsQuery}} and {{ConstantScoreQuery}}
> (and possibly others?), it is possible for
> {{SolrIndexSearcher.getDocListC(QueryResult, QueryCommand)}} to create a
> DocList directly from {{filterCache}} DocSets -- similar to
> {{useFilterForSortedQuery}}, but without actually sorting.
> This results in significant benefits for high-recall domains, including the
> common (and commonly-cached) use-case of {{q=\*:*}} and {{fq}}, facets, etc.
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