---------------------- I'm sorry, but the provided knowledge sources do not mention anything about Vercel AI vector stream in relation to LlamaIndex's Query Engine. The information available pertains to the use of LlamaIndex's Query Engine with various vector stores like Tencent Cloud VectorDB, Cassandra Vector Store, Baidu VectorDB, AnalyticDB, and Astra DB. It also mentions the use of OpenAI, HuggingFaceLLM, and LangChain LLMs for streaming responses.
For more specific information about Vercel AI vector stream with LlamaIndex's Query Engine, you may need to refer to the official documentation or resources that specifically cover this topic. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------