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https://issues.apache.org/jira/browse/LUCENE-7623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16059551#comment-16059551
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David Smiley commented on LUCENE-7623:
--------------------------------------

I'm a little surprised to see these additions in the Lucene queries module 
because I thought there was an overarching intent to bring the functionality of 
ValueSource's into Lucene core.  

Ramification: Now in LUCENE-7737 I think I see a case where spatial-extras 
PointVectorStrategy is adding a bunch more code that could be avoided if 
FunctionMatchQuery were in core.  Note that the Solr legacy copy of 
PointVectorStrategy in LUCENE-7737 is able to simply use FunctionMatchQuery.

> Add FunctionScoreQuery and FunctionMatchQuery
> ---------------------------------------------
>
>                 Key: LUCENE-7623
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7623
>             Project: Lucene - Core
>          Issue Type: New Feature
>            Reporter: Alan Woodward
>            Assignee: Alan Woodward
>            Priority: Minor
>             Fix For: 6.5
>
>         Attachments: LUCENE-7623.patch, LUCENE-7623.patch, LUCENE-7623.patch, 
> LUCENE-7623.patch, LUCENE-7623.patch, LUCENE-7623.patch
>
>
> We should update the various function scoring queries to use the new 
> DoubleValues API



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