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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