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https://issues.apache.org/jira/browse/SOLR-3855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13493197#comment-13493197
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Adrien Grand commented on SOLR-3855:
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Here are the details:
- stored fields and doc values are considered very different features (with
different parameter names in the schema to enable/disable them)
- fl=* would only load stored fields by default (so fields that have doc
values would also need to be stored if you want them to be loaded with fl=*),
- the fl parameter can accept field names that have doc values but are not
stored (and this would work as expected),
- DocValues would be useful for documents' unique keys and version numbers
(because having fast random access to these fields is important)
- if the fl parameter only contains one field that has both doc values and
stored fields enabled, it makes sense to use doc values (same number of disk
seeks in the worst case). Otherwise, it should stick to stored fields by
default. It might make sense to add an option to force doc values with several
fields in the field list (fl.docValues=true?) but we should add appropriate
warnings about it in the docs.
I'll update my patch soon. Yonik, please correct me if I'm wrong!
> DocValues support
> -----------------
>
> Key: SOLR-3855
> URL: https://issues.apache.org/jira/browse/SOLR-3855
> Project: Solr
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 4.1, 5.0
>
> Attachments: SOLR-3855.patch, SOLR-3855.patch
>
>
> It would be nice if Solr supported DocValues:
> - for ID fields (fewer disk seeks when running distributed search),
> - for sorting/faceting/function queries (faster warmup time than fieldcache),
> - better on-disk and in-memory efficiency (you can use packed impls).
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