class_docstr: Base connector class to be extended by all connectors.
docstr: Return the head of the data source that the connector is connected to.
  This information is passed to the LLM to provide the schema of the
  data source.
code: def head(self):
      """
      Return the head of the data source that the connector is connected to.
      This information is passed to the LLM to provide the schema of the
      data source.
      """
      pass
  
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 5 for calling the BaseConnector obj's underlying member method code with example usage: obj.head() without return types