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[Backport 1.3] Change initial size of DocIdSetBuilder #752

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Feb 7, 2023
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[Backport 1.3] Change initial size of DocIdSetBuilder #752

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5 changes: 4 additions & 1 deletion src/main/java/org/opensearch/knn/index/KNNWeight.java
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Original file line number Diff line number Diff line change
Expand Up @@ -186,7 +186,10 @@ public Scorer scorer(LeafReaderContext context) throws IOException {
.collect(Collectors.toMap(KNNQueryResult::getId, result -> knnEngine.score(result.getScore(), spaceType)));
int maxDoc = Collections.max(scores.keySet()) + 1;
DocIdSetBuilder docIdSetBuilder = new DocIdSetBuilder(maxDoc);
DocIdSetBuilder.BulkAdder setAdder = docIdSetBuilder.grow(maxDoc);

// The docIdSetIterator will contain the docids of the returned results. So, before adding results to
// the builder, we can grow to results.length
DocIdSetBuilder.BulkAdder setAdder = docIdSetBuilder.grow(results.length);
Arrays.stream(results).forEach(result -> setAdder.add(result.getId()));
DocIdSetIterator docIdSetIter = docIdSetBuilder.build().iterator();
return new KNNScorer(this, docIdSetIter, scores, boost);
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