[jira] [Updated] (LUCENE-7736) Expose some IndexReader stats via DoubleValuesSources

["Alan Woodward (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-7736?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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

Here is a patch, implementing all the IndexReader-specific ValueSources as DoubleValuesSource (or LongValuesSource, in the case of norms), and adding a couple of extra ones that were missing (docCount, sumDocFreq, numDeletedDocs).  The IndexReaderFunctions class is currently in the queries module, but it could easily be in core instead.

I haven't added the Similarity-specific sources here (idf, tf) - they could maybe added directly to TFIDFSimilarity in another issue

> 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
>
>
> 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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