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LUCENE-9352: Add iteratorCost function to Scorable #1554

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LUCENE-9352: Add iteratorCost function to Scorable #1554

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8 changes: 8 additions & 0 deletions lucene/core/src/java/org/apache/lucene/search/Scorable.java
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,14 @@ public void setMinCompetitiveScore(float minScore) throws IOException {
// no-op by default
}

/**
* Returns the estimated cost of the {@link DocIdSetIterator} associated with this {@link Scorable}.
* 0 is the default value if the {@link Scorable} doesn't have any associated {@link DocIdSetIterator}.
*/
public long iteratorCost() {
return 0;
}

/**
* Returns child sub-scorers positioned on the current document
* @lucene.experimental
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8 changes: 8 additions & 0 deletions lucene/core/src/java/org/apache/lucene/search/Scorer.java
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Expand Up @@ -71,6 +71,14 @@ public Weight getWeight() {
*/
public abstract DocIdSetIterator iterator();

/**
* Returns the estimated cost of the {@link DocIdSetIterator} associated with this {@link Scorer}.
*/
@Override
public long iteratorCost() {
return iterator().cost();
}

/**
* Optional method: Return a {@link TwoPhaseIterator} view of this
* {@link Scorer}. A return value of {@code null} indicates that
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