ChrisHegarty commented on code in PR #13872:
URL: https://github.com/apache/lucene/pull/13872#discussion_r1816669062
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lucene/core/src/java21/org/apache/lucene/internal/vectorization/Lucene99MemorySegmentByteVectorScorerSupplier.java:
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@@ -112,20 +96,20 @@ static final class CosineSupplier extends
Lucene99MemorySegmentByteVectorScorerS
@Override
public RandomVectorScorer scorer(int ord) {
checkOrdinal(ord);
+ MemorySegmentAccessInput slice = input.clone();
+ byte[] scratch1 = new byte[vectorByteSize];
+ byte[] scratch2 = new byte[vectorByteSize];
Review Comment:
We don't know during construction whether or not access to the vector data
in backing segment will *always* be available. The main reason is that a vector
may span across multiple memory segments. (one MSIndexInput can be made up of
several memory segments)
This change is not right. The scratch buffers are created per supplier,
since we know with the threading model that that is safe. Creating scratch
buffers per scorer will be too expensive.
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