docstr: Executes the native query on the database.
  Args:
      query_string (str): query in native format
  Returns:
      DBHandlerResponse
docstr_tok: ["Executes","the","native","query","on","the","database",".","Args",":","query_string","(","str",")",":","query","in","native","format","Returns",":","DBHandlerResponse"]
code: def execute_native_query(
      self, query_string: str
  ) -> DBHandlerResponse:
      """
      Executes the native query on the database.
      Args:
          query_string (str): query in native format
      Returns:
          DBHandlerResponse
      """
      if not self.connection:
          return DBHandlerResponse(
              data=None, error="Not connected to the database."
          )
  
      try:
          cursor = self.connection.cursor()
          cursor.execute(query_string)
          return DBHandlerResponse(
              data=self._fetch_results_as_df(cursor)
          )
      except Exception as e:
          return DBHandlerResponse(data=None, error=str(e))
  
file_path: evadb/evadb/third_party/databases/clickhouse/clickhouse_handler.py
imports: import pandas
  from sqlalchemy import create_engine
  from evadb.third_party.databases.types import DBHandler, DBHandlerResponse, DBHandlerStatus
label_desc: Use image node_id 8 for calling the ClickHouseHandler obj's underlying member method code with example usage: obj.execute_native_query(query_string) and returns: DBHandlerResponse, DBHandlerResponse, DBHandlerResponse