fix:memory create collection bug

Author: Aries-ckt

packages/dbgpt-ext/src/dbgpt_ext/storage/vector_store/oceanbase_store.py

@@ -311,7 +311,7 @@ def _create_table_with_index(self, embeddings: list) -> None:
     def create_collection(self, collection_name: str, **kwargs) -> Any:
         """Create the collection."""
         embeddings = self.embedding_function.embed_documents([collection_name])
-        raise self._create_table_with_index(embeddings)
+        return self._create_table_with_index(embeddings)
 
     def load_document(self, chunks: List[Chunk]) -> List[str]:
         """Load document in vector database."""

packages/dbgpt-serve/src/dbgpt_serve/agent/agents/controller.py

@@ -142,7 +142,10 @@ def get_or_build_agent_memory(self, conv_id: str, dbgpts_name: str) -> AgentMemo
         ).create()
 
         storage_manager = StorageManager.get_instance(self.system_app)
-        vector_store = storage_manager.create_vector_store(index_name="_agent_memory_")
+        index_name = "_agent_memory_"
+        vector_store = storage_manager.create_vector_store(index_name=index_name)
+        if not vector_store.vector_name_exists():
+            vector_store.create_collection(collection_name=index_name)
         embeddings = EmbeddingFactory.get_instance(self.system_app).create()
         short_term_memory = EnhancedShortTermMemory(
             embeddings, executor=executor, buffer_size=10