text: 2802/2802 [02:26<00:00, 19.11it/s]    zya.langchain @ 127.0.0.1:41003        username: root        Table Schema:    ----------------------------------------------------------------------------    |name                    |type                    |key                     |    ----------------------------------------------------------------------------    |id                      |varchar(65533)          |true                    |    |document                |varchar(65533)          |false                   |    |embedding               |array<float>            |false                   |    |metadata                |varchar(65533)          |false                   |    ----------------------------------------------------------------------------    Build QA and ask question to itâ€‹llm = OpenAI()qa = RetrievalQA.from_chain_type(