class_docstr: Python interface for SQL connections
docstr: Returns the names and schema for the tables that are provided by the connection.
  These are the tables that may be referenced by SQL queries passed to the
  fetch_query method
  
  :return: dict from table name to pa.Schema
docstr_tok: ["Returns","the","names","and","schema","for","the","tables","that","are","provided","by","the","connection",".","These","are","the","tables","that","may","be","referenced","by","SQL","queries","passed","to","the","fetch_query","method",":","return",":","dict","from","table","name","to","pa.Schema"]
code: def tables(self) -> Dict[str, pa.Schema]:
      """
      Returns the names and schema for the tables that are provided by the connection.
      These are the tables that may be referenced by SQL queries passed to the
      fetch_query method
  
      :return: dict from table name to pa.Schema
      """
      raise NotImplementedError()
  
imports: from typing import Dict, Optional
  import pandas
  import pyarrow
  from dataclasses import dataclass
  from abc import ABC, abstractmethod
label_desc: Use image node_id 2 for calling the SqlConnection obj's underlying member method code with example usage: obj.tables() without return types