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https://issues.apache.org/jira/browse/LUCENE-7736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16211308#comment-16211308
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Alan Woodward commented on LUCENE-7736:
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bq. I think it's important for equals to behave correctly and never return true
for values sources that could return different values.
Ah, I see what you mean - if we had a FunctionMatchQuery that was cached across
multiple IndexSearcher reopens it would potentially return the wrong values,
because the underlying DoubleValues defined by the top-level index readers.
I'll change things back again.
bq. I think you forgot to update FunctionMatchQuery
I did, thanks for picking it up...
> 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,
> 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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