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https://issues.apache.org/jira/browse/LUCENE-7736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15963970#comment-15963970
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Alan Woodward commented on LUCENE-7736:
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bq. I'm wondering whether we should try to detect double rewrite
So have an AssertingDoubleValuesSource? I like that idea, although I'm not
sure where it would get injected into the tests.
bq. wouldn't LongValueSource be more fitting/appropriate?
DoubleValuesSource is used in more places though (FunctionScoreQuery,
Expressions module), so I think it's more useable this way. I guess I see
LongValuesSource as a convenience wrapper, and DoubleValuesSource as the core
API.
> 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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