class_docstr: Reuses PrestoEngineSpec functionality.
class_docstr_tok: ["Reuses","PrestoEngineSpec","functionality","."]
docstr: Update a configuration dictionary
  that can set the correct properties for impersonating users
  :param connect_args:
  :param uri: URI string
  :param impersonate_user: Flag indicating if impersonation is enabled
  :param username: Effective username
  :return: None
docstr_tok: ["Update","a","configuration","dictionary","that","can","set","the","correct","properties","for","impersonating","users",":","param","connect_args",":",":","param","uri",":","URI","string",":","param","impersonate_user",":","Flag","indicating","if","impersonation","is","enabled",":","param","username",":","Effective","username",":","return",":","None"]
code: def update_impersonation_config(
      cls,
      connect_args: dict[str, Any],
      uri: str,
      username: str | None,
  ) -> None:
      """
      Update a configuration dictionary
      that can set the correct properties for impersonating users
      :param connect_args:
      :param uri: URI string
      :param impersonate_user: Flag indicating if impersonation is enabled
      :param username: Effective username
      :return: None
      """
      url = make_url_safe(uri)
      backend_name = url.get_backend_name()
  
      # Must be Hive connection, enable impersonation, and set optional param
      # auth=LDAP|KERBEROS
      # this will set hive.server2.proxy.user=$effective_username on connect_args['configuration']
      if backend_name == "hive" and username is not None:
          configuration = connect_args.get("configuration", {})
          configuration["hive.server2.proxy.user"] = username
          connect_args["configuration"] = configuration
  
imports: from __future__ import annotations
  import logging
  import os
  import re
  import tempfile
  import time
  from datetime import datetime
  from typing import Any, TYPE_CHECKING
  from urllib import parse
  import numpy
  import pandas
  import pyarrow
  import pyarrow.parquet
  from flask import current_app, g
  from sqlalchemy import Column, text, types
  from sqlalchemy.engine.base import Engine
  from sqlalchemy.engine.reflection import Inspector
  from sqlalchemy.engine.url import URL
  from sqlalchemy.sql.expression import ColumnClause, Select
  from superset import db
  from superset.common.db_query_status import QueryStatus
  from superset.constants import TimeGrain
  from superset.databases.utils import make_url_safe
  from superset.db_engine_specs.base import BaseEngineSpec
  from superset.db_engine_specs.presto import PrestoEngineSpec
  from superset.exceptions import SupersetException
  from superset.extensions import cache_manager
  from superset.models.sql_lab import Query
  from superset.sql_parse import ParsedQuery, Table
  from superset.superset_typing import ResultSetColumnType
label_desc: Use image node_id 19 for calling the HiveEngineSpec obj's underlying member method code with example usage: obj.update_impersonation_config(cls, connect_args, uri, username) without return types