class_docstr: Engine spec for clickhouse_sqlalchemy connector
code: def get_dbapi_exception_mapping(
      cls,
  ) -> dict[type[Exception], type[Exception]]:
      return {NewConnectionError: SupersetDBAPIDatabaseError}
  
imports: from __future__ import annotations
  import logging
  import re
  from datetime import datetime
  from typing import Any, cast, TYPE_CHECKING
  from flask import current_app
  from flask_babel import gettext
  from marshmallow import fields, Schema
  from marshmallow.validate import Range
  from sqlalchemy import types
  from sqlalchemy.engine.url import URL
  from urllib3.exceptions import NewConnectionError
  from superset.databases.utils import make_url_safe
  from superset.db_engine_specs.base import BaseEngineSpec, BasicParametersMixin, BasicParametersType, BasicPropertiesType
  from superset.db_engine_specs.exceptions import SupersetDBAPIDatabaseError
  from superset.errors import ErrorLevel, SupersetError, SupersetErrorType
  from superset.extensions import cache_manager
  from superset.utils.core import GenericDataType
  from superset.utils.hashing import md5_sha_from_str
  from superset.utils.network import is_hostname_valid, is_port_open
label_desc: Use image node_id 1 for calling the ClickHouseEngineSpec obj's underlying member method code with example usage: obj.get_dbapi_exception_mapping(cls) and returns: dict