langchain

57ade13b - fix llm_inputs duplication problem in intermediate_steps in SQLDatabaseChain (#10279)

fix llm_inputs duplication problem in intermediate_steps in SQLDatabaseChain (#10279) Use `.copy()` to fix the bug that the first `llm_inputs` element is overwritten by the second `llm_inputs` element in `intermediate_steps`. ***Problem description:*** In [line 127]( https://github.com/langchain-ai/langchain/blob/c732d8fffd39d2b02bdc393c37d2ccdd48f7626d/libs/experimental/langchain_experimental/sql/base.py#L127C17-L127C17), the `llm_inputs` of the sql generation step is appended as the first element of `intermediate_steps`: ``` intermediate_steps.append(llm_inputs) # input: sql generation ``` However, `llm_inputs` is a mutable dict, it is updated in [line 179](https://github.com/langchain-ai/langchain/blob/master/libs/experimental/langchain_experimental/sql/base.py#L179) for the final answer step: ``` llm_inputs["input"] = input_text ``` Then, the updated `llm_inputs` is appended as another element of `intermediate_steps` in [line 180](https://github.com/langchain-ai/langchain/blob/c732d8fffd39d2b02bdc393c37d2ccdd48f7626d/libs/experimental/langchain_experimental/sql/base.py#L180): ``` intermediate_steps.append(llm_inputs) # input: final answer ``` As a result, the final `intermediate_steps` returned in [line 189](https://github.com/langchain-ai/langchain/blob/c732d8fffd39d2b02bdc393c37d2ccdd48f7626d/libs/experimental/langchain_experimental/sql/base.py#L189C43-L189C43) actually contains two same `llm_inputs` elements, i.e., the `llm_inputs` for the sql generation step overwritten by the one for final answer step by mistake. Users are not able to get the actual `llm_inputs` for the sql generation step from `intermediate_steps` Simply calling `.copy()` when appending `llm_inputs` to `intermediate_steps` can solve this problem.