jainankitk commented on code in PR #16144:
URL: https://github.com/apache/lucene/pull/16144#discussion_r3323160537
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lucene/test-framework/src/java/org/apache/lucene/tests/search/AssertingLeafCollector.java:
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@@ -47,7 +50,37 @@ class AssertingLeafCollector extends FilterLeafCollector {
@Override
public void setScorer(Scorable scorer) throws IOException {
- super.setScorer(AssertingScorable.wrap(scorer));
+ Scorable wrappedScorer = AssertingScorable.wrap(scorer);
+ if (wrappedScorer instanceof Scorer wrappedScorerAsScorer) {
+ super.setScorer(
+ new FilterScorer(wrappedScorerAsScorer) {
+ @Override
+ public float score() throws IOException {
+ assert batchCollectionDepth == 0
Review Comment:
This assertion only fires when the wrapped scorable is a `Scorer`. Should we
consider extending it to the `AssertingScorable` branch?
##########
lucene/core/src/java/org/apache/lucene/search/LeafCollector.java:
##########
@@ -94,6 +94,11 @@ public interface LeafCollector {
* <p>The default implementation calls {@link #collect(DocIdStream)} on a
{@link DocIdStream} that
* matches the given range.
*
+ * <p>The {@link Scorable} set via {@link #setScorer} is not guaranteed to
be positioned on any
+ * document within the range. Implementations must not call {@link
Scorable#score()} or rely on
+ * scorer positioning inside this method. Use {@link #collect(int)} if
per-document scores are
+ * needed.
Review Comment:
Nit: rather than "must not call Scorable#score() or rely on scorer
positioning," we can phrase this as a contract on the scorer state — "the
scorer's position is undefined within this method; callers must not call
Scorable#score() and must not assume Scorable#docID() corresponds to any
document being collected."
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