myenv/Lib/site-packages/langchain/chains/query_constructor/schema.py

from langchain_core.pydantic_v1 import BaseModel


class AttributeInfo(BaseModel):
    """Information about a data source attribute."""

    name: str
    description: str
    type: str

    class Config:
        """Configuration for this pydantic object."""

        arbitrary_types_allowed = True
        frozen = True