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https://issues.apache.org/jira/browse/SOLR-12697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16843228#comment-16843228
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Stanislav Livotov commented on SOLR-12697:
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[~erickerickson] thanks for the reply.
I agree with all your concerns, and that's why we had used to docValues to
optimize model reading and consequently, that's why this Jira was opened.
However:
# All fieldValue features are by the flow isolated from each other, so there
is no possibility to gather all required fields and then fetch them from the
stored document fields.
# From my POV we can not cut the part related to reading values from stored
document cause initially, it was the only supported way. It will be not
backward compatible change, and I don't think that it is a good idea. Moreover,
I can even imagine some cases when loading from stored fields can work with the
same time or even work faster(In case of documentCache enabled with
enableLazyFieldLoading=false and when only required fields are stored). So
probably in some cases, it is not so bad idea. But probably we need to
explicitly mention it in the LTR documentation or at least in javaDoc?
> 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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