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Posted to issues@lucene.apache.org by "David Smiley (Jira)" <ji...@apache.org> on 2020/01/06 02:53:00 UTC

[jira] [Created] (LUCENE-9114) Add FunctionValues.cost

David Smiley created LUCENE-9114:
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             Summary: 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


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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