Robert Muir created LUCENE-6276:
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Summary: Add matchCost() api to TwoPhaseDocIdSetIterator
Key: LUCENE-6276
URL: https://issues.apache.org/jira/browse/LUCENE-6276
Project: Lucene - Core
Issue Type: Improvement
Reporter: Robert Muir
We could add a method like TwoPhaseDISI.matchCost() defined as something like
estimate of nanoseconds or similar.
ConjunctionScorer could use this method to sort its 'twoPhaseIterators' array
so that cheaper ones are called first. Today it has no idea if one scorer is a
simple phrase scorer on a short field vs another that might do some geo
calculation or more expensive stuff.
PhraseScorers could implement this based on index statistics (e.g.
totalTermFreq/maxDoc)
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