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From "Ishan Chattopadhyaya (JIRA)" <>
Subject [jira] [Updated] (SOLR-8220) Read field from docValues for non stored fields
Date Mon, 16 Nov 2015 11:34:11 GMT


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

Updated your patch to trunk (svn) with no changes to your logic. I'll review it soon.

> Read field from docValues for non stored fields
> -----------------------------------------------
>                 Key: SOLR-8220
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Keith Laban
>         Attachments: 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
> 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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