Adrien Grand created LUCENE-10397:
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Summary: KnnVectorQuery doesn't tie break by doc ID
Key: LUCENE-10397
URL: https://issues.apache.org/jira/browse/LUCENE-10397
Project: Lucene - Core
Issue Type: Task
Reporter: Adrien Grand
I was expecting KnnVectorQUery to tie-break by doc ID so that if multiple
documents get the same score then the ones that have the lowest doc ID would
get returned first, similarly to how SortField.SCORE also tie-breaks by doc ID.
However the following test fails, suggesting that it is not the case.
{code:java}
public void testTieBreak() throws IOException {
try (Directory d = newDirectory()) {
try (IndexWriter w = new IndexWriter(d, new IndexWriterConfig())) {
for (int j = 0; j < 5; j++) {
Document doc = new Document();
doc.add(
new KnnVectorField("field", new float[] {0, 1},
VectorSimilarityFunction.DOT_PRODUCT));
w.addDocument(doc);
}
}
try (IndexReader reader = DirectoryReader.open(d)) {
assertEquals(1, reader.leaves().size());
IndexSearcher searcher = new IndexSearcher(reader);
KnnVectorQuery query = new KnnVectorQuery("field", new float[] {2, 3},
3);
TopDocs topHits = searcher.search(query, 3);
assertEquals(0, topHits.scoreDocs[0].doc);
assertEquals(1, topHits.scoreDocs[1].doc);
assertEquals(2, topHits.scoreDocs[2].doc);
}
}
}
{code}
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