class_docstr: Base connector class to be extended by all connectors.
docstr: Return the hash code that is unique to the columns of the data source
  that the connector is connected to.
code: def column_hash(self):
      """
      Return the hash code that is unique to the columns of the data source
      that the connector is connected to.
      """
      raise NotImplementedError
  
imports: from abc import ABC, abstractmethod
  import os
  from ..helpers.df_info import DataFrameType
  from ..helpers.logger import Logger
  from pydantic import BaseModel
  from typing import Optional, Union
label_desc: Use image node_id 10 for calling the BaseConnector obj's underlying member method code with example usage: obj.column_hash() without return types