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https://issues.apache.org/jira/browse/SOLR-12697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16838794#comment-16838794
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Christine Poerschke commented on SOLR-12697:
--------------------------------------------

Thanks [~erickerickson] for the ping(s)! I'd seen your earlier comments but 
had/have only limited time to continue here.

The just attached patch rebases against latest master, shrinking the patch now 
that the SOLR-13049 portion of it is committed.
{quote}Can SOLR-12625 be used in this case or, perhaps, reworked to make it 
usable here? ...
{quote}
{quote}... the calls to SolrDocumentFetcher, ...
{quote}
>From a quick look there are several public {{SolrDocumentFetcher}} methods. 
>[~slivotov] would you perhaps recall anything about how you chose the method 
>to call? I'm not yet familiar with the {{SolrDocumentFetcher}} class.

And two things I noticed and wondered whilst rebasing the patch:
 * {{FieldValueFeature.fieldAsSet}} can now be removed since it becomes unused 
with the changes here?
 * {{docFetcher}} and {{returnFields}} are currently 
{{FieldValueFeatureScorer}} members, could they be {{FieldValueFeatureWeight}} 
members instead?

> pure DocValues support for FieldValueFeature
> --------------------------------------------
>
>                 Key: SOLR-12697
>                 URL: https://issues.apache.org/jira/browse/SOLR-12697
>             Project: Solr
>          Issue Type: Sub-task
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: contrib - LTR
>            Reporter: Stanislav Livotov
>            Priority: Major
>         Attachments: SOLR-12697.patch, SOLR-12697.patch, SOLR-12697.patch, 
> SOLR-12697.patch
>
>
> [~slivotov] wrote in SOLR-12688:
> bq. ... FieldValueFeature doesn't support pure DocValues fields (Stored 
> false). Please also note that for fields which are both stored and DocValues 
> it is working not optimal because it is extracting just one field from the 
> stored document. DocValues are obviously faster for such usecases. ...
> (Please see SOLR-12688 description for overall context and analysis results.)



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