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https://issues.apache.org/jira/browse/SOLR-12697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16842814#comment-16842814
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Stanislav Livotov commented on SOLR-12697:
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[~cpoerschke] agree that now we can remove {{FieldValueFeature.fieldAsSet}} and
I don't see a big difference where to store {{docFetcher}} and {{returnFields}}
but we definitely can do it, so I had moved it there. I had applied a new patch
with these small changes.
I'm also not so well familiar with {{SolrDocumentFetcher}}, but documentation
of the {{SolrDocumentFetcher#solrDoc}} is telling that it is "_an optimized
version for populating a SolrDocument_", and that it first of all "_fetches all
fields from docValues if possible_", and that's what I think we want cause DV
fields retrieving is faster.
[~erickerickson] do you mean that retrieving just 1 field from stored fields is
not optimal? Do you want to restrict it in this case? But it will be the change
in behavior, cause previously only retrieval from stored fields was
supported(by usingcontext.reader().document(itr.docID()).
> 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, 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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