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https://issues.apache.org/jira/browse/LUCENE-7623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15817100#comment-15817100
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David Smiley commented on LUCENE-7623:
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Looks alright but I didn't review thoroughly. I noticed one problem:
{{TwoPhaseIterator.matchCost}} as implemented here isn't right. It's supposed
to be the match cost for a _single document_, thus returning maxDocs is
definitely not the right response. See the javadocs. Unfortunately since
DoubleValueSource has no similar cost, you can't propagate... so might as well
return some constant. Judging from existing impls... anywhere between 10 and
100 is good to me.
> 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
> Attachments: LUCENE-7623.patch, LUCENE-7623.patch
>
>
> We should update the various function scoring queries to use the new
> DoubleValues API
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