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https://issues.apache.org/jira/browse/LUCENE-7736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15963988#comment-15963988
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Uwe Schindler commented on LUCENE-7736:
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I was thinking about this: Why do we need a static-method-only helper class
(that should have a private constructor, please!)? Would it not be possible to
add these methods as default impls to LeafReader? I have not looked into the
details, but this looks more easy to understand. I agree the current code can
be separate from core, but once we move to core, I'd add that to the
LeafReaders.
> 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
> Attachments: 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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