code: def show_files(self, name, database=None):
          
          stmt = self._table_command('SHOW FILES IN', name, database=database)
          return self._exec_statement(stmt)
docs: Retrieve results of SHOW FILES command for a table. See Impala
          documentation for more.
  
          Parameters
          ----------
          name : string
            Table name. Can be fully qualified (with database)
          database : string, optional