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https://issues.apache.org/jira/browse/SOLR-5478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15206379#comment-15206379
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David Smiley commented on SOLR-5478:
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Definitely keep this open; these issues are somewhat related but aren't the
same thing. If we can get to the point that Solr will automatically know to
return the uniqueKey field via docValues (assuming docValues are enabled for
it) when it's the only field you ask for, then we can call this issue done.
That specific optimization for just asking for the ID is key because any
distributed search is going to do this in its first phase to find the top-X
docs. Of course, it'd be nice if it could do this in a broader set of cases
too.
> Speed-up distributed search with high rows param or deep paging by
> transforming docId's to uniqueKey via memory docValues
> -------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-5478
> URL: https://issues.apache.org/jira/browse/SOLR-5478
> Project: Solr
> Issue Type: Improvement
> Components: Response Writers
> Affects Versions: 4.5
> Reporter: Manuel Lenormand
> Fix For: 4.9, master
>
> Attachments: SOLR-5478 smiley fl.fieldCacheFields.patch,
> SOLR-5478.patch, SOLR-5478.patch
>
>
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