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https://issues.apache.org/jira/browse/SOLR-5478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley updated SOLR-5478:
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Description:
When the "fl" field list mentions a list of fields that all have docValues, and
they are equivalent to the stored version (not true for multiValued field due
to ordering), then we can fetch the values more efficiently from docValues than
from stored values. If this can't be done, might as well fetch them all from
stored values when they have both (this is what happens today).
Former title: Speed-up distributed search with high rows param or deep paging
by transforming docId's to uniqueKey via memory docValues
Originally the scope of this was just for the uniqueKey but now it's broader.
Summary: Optimization: Fetch all "fl" values from docValues instead of
stored values if possible/equivalent (was: Speed-up distributed search with
high rows param or deep paging by transforming docId's to uniqueKey via memory
docValues)
> Optimization: Fetch all "fl" values from docValues instead of stored values
> if possible/equivalent
> --------------------------------------------------------------------------------------------------
>
> Key: SOLR-5478
> URL: https://issues.apache.org/jira/browse/SOLR-5478
> Project: Solr
> Issue Type: Improvement
> Components: Response Writers
> Affects Versions: 4.5
> Reporter: Manuel Lenormand
> Fix For: 4.9, 6.0
>
> Attachments: SOLR-5478.patch, SOLR-5478.patch, SOLR-5478 smiley
> fl.fieldCacheFields.patch
>
>
> When the "fl" field list mentions a list of fields that all have docValues,
> and they are equivalent to the stored version (not true for multiValued field
> due to ordering), then we can fetch the values more efficiently from
> docValues than from stored values. If this can't be done, might as well
> fetch them all from stored values when they have both (this is what happens
> today).
> Former title: Speed-up distributed search with high rows param or deep paging
> by transforming docId's to uniqueKey via memory docValues
> Originally the scope of this was just for the uniqueKey but now it's broader.
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