mirror of https://github.com/hwchase17/langchain
Import of `declarative_base` when SQLAlchemy <1.4 (#883)
In [pyproject.toml](https://github.com/hwchase17/langchain/blob/master/pyproject.toml), the expectation is `SQLAlchemy = "^1"`. But, the way `declarative_base` is imported in [cache.py](https://github.com/hwchase17/langchain/blob/master/langchain/cache.py) will only work with SQLAlchemy >=1.4. This PR makes sure Langchain can be run in environments with SQLAlchemy <1.4pull/890/head^2
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