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https://issues.apache.org/jira/browse/LUCENE-7736?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Woodward resolved LUCENE-7736.
-----------------------------------
       Resolution: Fixed
    Fix Version/s: 7.2

> Expose some IndexReader stats via DoubleValuesSources
> -----------------------------------------------------
>
>                 Key: LUCENE-7736
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7736
>             Project: Lucene - Core
>          Issue Type: New Feature
>            Reporter: Alan Woodward
>            Assignee: Alan Woodward
>            Priority: Minor
>             Fix For: 7.2
>
>         Attachments: LUCENE-7736.patch, LUCENE-7736.patch, LUCENE-7736.patch, 
> LUCENE-7736.patch, LUCENE-7736.patch, LUCENE-7736.patch
>
>
> We have a number of ValueSource implementations that expose IndexReader stats 
> (numDocs, termFreq, etc).  We should re-implement these as 
> DoubleValuesSources, allowing them to be used in FunctionScoreQuery, etc.



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