code: def unset(self, key: str) -> None:
      op_unset = proto.ConfigRequest.Unset(keys=[key])
      operation = proto.ConfigRequest.Operation(unset=op_unset)
      result = self._client.config(operation)
      for warn in result.warnings:
          warnings.warn(warn)
  
file_path: spark/python/pyspark/sql/connect/conf.py
imports: from pyspark.errors import PySparkValueError, PySparkTypeError
  from pyspark.sql.connect.utils import check_dependencies
  from typing import Any, Optional, Union, cast
  import warnings
  from pyspark import _NoValue
  from pyspark._globals import _NoValueType
  from pyspark.sql.conf import RuntimeConfig
  from pyspark.sql.connect import proto
  from pyspark.sql.connect.client import SparkConnectClient
label_desc: Use image node_id 4 for calling the RuntimeConf obj's underlying member method code with example usage: obj.unset(key) without return types