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https://issues.apache.org/jira/browse/SOLR-17985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18037288#comment-18037288
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ASF subversion and git services commented on SOLR-17985:
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Commit a72691c3b119fc32976f7a5653bf3e003f23217b in solr's branch 
refs/heads/main from Houston Putman
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=a72691c3b11 ]

SOLR-17985: Speed up no-rows distributed queries (#3849)



> Make rows=0 queries fast again
> ------------------------------
>
>                 Key: SOLR-17985
>                 URL: https://issues.apache.org/jira/browse/SOLR-17985
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 9.9
>            Reporter: Houston Putman
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> SOLR-17732 improved score returning for distributed requests, but 
> unfortunately it also slowed down queries that fetch no documents. This is 
> because it added the {{score}} "field" to fl whenever the sort spec needed it 
> (including when no sort was provided), because the distributed merge logic 
> would need the value. However when zero docs are requested, there is no 
> distributed merging to be done. So we are asking for scores, which make the 
> search scan all documents to generate scores even though we don't need any.



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