[jira] [Updated] (SOLR-8220) Read field from docValues for non stored fields

["Ishan Chattopadhyaya (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-8220?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ishan Chattopadhyaya updated SOLR-8220:
---------------------------------------
    Attachment: SOLR-8220.patch

Updating the patch.
# Only tackles non-stored docvalues.
# Depends on the refactoring performed at SOLR-8339.

> Read field from docValues for non stored fields
> -----------------------------------------------
>
>                 Key: SOLR-8220
>                 URL: https://issues.apache.org/jira/browse/SOLR-8220
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Keith Laban
>         Attachments: SOLR-8220-ishan.patch, SOLR-8220-ishan.patch, SOLR-8220-ishan.patch, SOLR-8220-ishan.patch, SOLR-8220.patch, SOLR-8220.patch, SOLR-8220.patch, SOLR-8220.patch, SOLR-8220.patch, SOLR-8220.patch, SOLR-8220.patch, SOLR-8220.patch
>
>
> Many times a value will be both stored="true" and docValues="true" which requires redundant data to be stored on disk. Since reading from docValues is both efficient and a common practice (facets, analytics, streaming, etc), reading values from docValues when a stored version of the field does not exist would be a valuable disk usage optimization.
> The only caveat with this that I can see would be for multiValued fields as they would always be returned sorted in the docValues approach. I believe this is a fair compromise.
> I've done a rough implementation for this as a field transform, but I think it should live closer to where stored fields are loaded in the SolrIndexSearcher.
> Two open questions/observations:
> 1) There doesn't seem to be a standard way to read values for docValues, facets, analytics, streaming, etc, all seem to be doing their own ways, perhaps some of this logic should be centralized.
> 2) What will the API behavior be? (Below is my proposed implementation)
> Parameters for fl:
> - fl="docValueField"
>   -- return field from docValue if the field is not stored and in docValues, if the field is stored return it from stored fields
> - fl="*"
>   -- return only stored fields
> - fl="+"
>    -- return stored fields and docValue fields
> 2a - would be easiest implementation and might be sufficient for a first pass. 2b - is current behavior



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