fix: metadata filter not work (#19020)

Co-authored-by: 金鹏程 <jinpengcheng01@corp.netease.com>
Co-authored-by: crazywoola <427733928@qq.com>

api/core/agent/cot_agent_runner.py

@@ -69,6 +69,13 @@ class CotAgentRunner(BaseAgentRunner, ABC):
         tool_instances, prompt_messages_tools = self._init_prompt_tools()
         self._prompt_messages_tools = prompt_messages_tools
 
+        # fix metadata filter not work
+        if app_config.dataset is not None:
+            metadata_filtering_conditions = app_config.dataset.retrieve_config.metadata_filtering_conditions
+            for key, dataset_retriever_tool in tool_instances.items():
+                if hasattr(dataset_retriever_tool, "retrieval_tool"):
+                    dataset_retriever_tool.retrieval_tool.metadata_filtering_conditions = metadata_filtering_conditions
+
         function_call_state = True
         llm_usage: dict[str, Optional[LLMUsage]] = {"usage": None}
         final_answer = ""