fix: return empty list instead of raising exception for qdrant search when score_threshold is 1 (#24032)

api/tests/integration_tests/vdb/qdrant/test_qdrant.py

@@ -1,4 +1,5 @@
 from core.rag.datasource.vdb.qdrant.qdrant_vector import QdrantConfig, QdrantVector
+from core.rag.models.document import Document
 from tests.integration_tests.vdb.test_vector_store import (
     AbstractVectorTest,
     setup_mock_redis,
@@ -18,6 +19,14 @@ class QdrantVectorTest(AbstractVectorTest):
             ),
         )
 
+    def search_by_vector(self):
+        super().search_by_vector()
+        # only test for qdrant, may not work on other vector stores
+        hits_by_vector: list[Document] = self.vector.search_by_vector(
+            query_vector=self.example_embedding, score_threshold=1
+        )
+        assert len(hits_by_vector) == 0
+
 
 def test_qdrant_vector(setup_mock_redis):
     QdrantVectorTest().run_all_tests()