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https://issues.apache.org/jira/browse/LUCENE-9114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17047928#comment-17047928
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David Smiley commented on LUCENE-9114:
--------------------------------------
If this is too time-consuming, we could reduce the scope to merely make the
cost settable by a query parser (this issue not touching any query parser,
however). That's the minimum I need to unblock using the costs on the Solr
side (it's QParsers), which I want to do after this.
> Add FunctionValues.cost
> -----------------------
>
> Key: LUCENE-9114
> URL: https://issues.apache.org/jira/browse/LUCENE-9114
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/query
> Reporter: David Smiley
> Priority: Major
>
> The FunctionRangeQuery uses FunctionValues.getRangeScorer which returns a
> subclass of ValueSourceScorer. VSC's TwoPhaseIterator has a matchCost impl
> that returns a constant 100. This is pretty terrible; the cost should vary
> based on the complexity of the ValueSource provided to FRQ. ValueSource's
> are typically nested a number of levels, so they should aggregate.
> BTW there is a parallel concern for FunctionMatchQuery which works with
> DoubleValuesSource which doesn't have a cost either, and unsurprisingly there
> is a TPI with matchCost 100 there.
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