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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 updated LUCENE-7736:
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    Attachment: LUCENE-7736.patch

Patch bringing this up-to-date.  Relevant changes are:
* IndexReaderFunctions is final, and I moved the constructor to the top for 
Uwe's sake :)
* Everything implements hashCode and equals now, which means concrete 
implementations rather than anonymous classes.
* One wrinkle here is that we can't compare closures, so 
IndexReaderDoubleValuesSource only uses its description field for comparisons.  
These are all private implementations, and there's a comment to that effect, so 
I think this is OK.

I haven't added anything about checking for double-rewrite, as it doesn't 
really matter for any of the current implementations - everything either 
rewrites to a constant, or returns itself.

> 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, 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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