code: def list_databases(self, like=None):
          
          statement = 'SHOW DATABASES'
          if like:
              statement += " LIKE '{0}'".format(like)
  
          with self._execute(statement, results=True) as cur:
              results = self._get_list(cur)
  
          return results
docs: List databases in the Impala cluster. Like the SHOW DATABASES command
          in the impala-shell.
  
          Parameters
          ----------
          like : string, default None
            e.g. 'foo*' to match all tables starting with 'foo'
  
          Returns
          -------
          databases : list of strings