chore: import upstream snapshot with attribution

examples/rag/rewrite_rag_example.py

@@ -0,0 +1,42 @@
+"""Query rewrite example.
+
+pre-requirements:
+    1. install openai python sdk
+    ```
+        pip install openai
+    ```
+    2. set openai key and base
+    ```
+        export OPENAI_API_KEY={your_openai_key}
+        export OPENAI_API_BASE={your_openai_base}
+    ```
+    or
+    ```
+        import os
+        os.environ["OPENAI_API_KEY"] = {your_openai_key}
+        os.environ["OPENAI_API_BASE"] = {your_openai_base}
+    ```
+Examples:
+    ..code-block:: shell
+        python examples/rag/rewrite_rag_example.py
+"""
+
+import asyncio
+
+from dbgpt.model.proxy import OpenAILLMClient
+from dbgpt.rag.retriever import QueryRewrite
+
+
+async def main():
+    query = "compare steve curry and lebron james"
+    llm_client = OpenAILLMClient()
+    reinforce = QueryRewrite(
+        llm_client=llm_client,
+        model_name="gpt-3.5-turbo",
+    )
+    return await reinforce.rewrite(origin_query=query, nums=1)
+
+
+if __name__ == "__main__":
+    output = asyncio.run(main())
+    print(f"output: \n\n{output}")