code: def truncate(self, async_=False, **kw):
          
          from .tasks import SQLTask
          async_ = kw.get('async', async_)
          task = SQLTask(name='SQLTruncateTableTask', query='truncate table %s.%s' % (self.project.name, self.name))
          instance = self.project.parent[self._client.project].instances.create(task=task)
  
          if not async_:
              instance.wait_for_success()
          else:
              return instance
docs: truncate this table.
  
          :param async_: run asynchronously if True
          :return: None