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https://issues.apache.org/jira/browse/SOLR-5478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16171004#comment-16171004
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Cao Manh Dat edited comment on SOLR-5478 at 9/19/17 2:12 AM:
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Hi [~dsmiley] [~varunthacker], I think commit on SOLR-8344 solved this issue as 
well then this issue can be closed. In case we want to change the optimization 
algorithm, we can open another ticket with a detailed proposal about the 
changing. 


was (Author: caomanhdat):
Hi [~dsmiley] [~varunthacker], I think commit on SOLR-8344 solved this issue as 
well. In case we want to change the optimization algorithm, we can open another 
ticket with a detailed proposal about the changing. 

> Optimization: Fetch all "fl" values from docValues instead of stored values 
> if possible/equivalent
> --------------------------------------------------------------------------------------------------
>
>                 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, 6.0
>
>         Attachments: SOLR-5478.patch, SOLR-5478.patch, SOLR-5478 smiley 
> fl.fieldCacheFields.patch
>
>
> When the "fl" field list mentions a list of fields that all have docValues, 
> and they are equivalent to the stored version (not true for multiValued field 
> due to ordering), then we can fetch the values more efficiently from 
> docValues than from stored values.  If this can't be done, might as well 
> fetch them all from stored values when they have both (this is what happens 
> today).
> Former title: Speed-up distributed search with high rows param or deep paging 
> by transforming docId's to uniqueKey via memory docValues
> Originally the scope of this was just for the uniqueKey but now it's broader.



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