code: def load_tables(self, query, meta):
          
          try:
              for table in meta.tables:
                  self.load_table(table)
          except NoCredentialsError:
              help_link = 'http://boto3.readthedocs.io/en/latest/guide/configuration.html'
              raise QueryError('Unable to locate AWS credential. '
                               'Please see {0} on how to configure AWS credential.'.format(help_link))
docs: Load necessary resources tables into db to execute given query.