feat(rag): Support RAG SDK (#1322)

dbgpt/rag/operators/assembler.py

@@ -0,0 +1,24 @@
+"""Base Assembler Operator."""
+from abc import abstractmethod
+
+from dbgpt.core.awel import MapOperator
+from dbgpt.core.awel.task.base import IN, OUT
+
+
+class AssemblerOperator(MapOperator[IN, OUT]):
+    """The Base Assembler Operator."""
+
+    async def map(self, input_value: IN) -> OUT:
+        """Map input value to output value.
+
+        Args:
+            input_value (IN): The input value.
+
+        Returns:
+            OUT: The output value.
+        """
+        return await self.blocking_func_to_async(self.assemble, input_value)
+
+    @abstractmethod
+    def assemble(self, input_value: IN) -> OUT:
+        """Assemble knowledge for input value."""