code: def task_table(self, task_id=None):
          
          self._check_connected()
          if task_id is not None:
              task_id = ray.TaskID(hex_to_binary(task_id))
              return self._task_table(task_id)
          else:
              task_table_keys = self._keys(
                  ray.gcs_utils.TablePrefix_RAYLET_TASK_string + "*")
              task_ids_binary = [
                  key[len(ray.gcs_utils.TablePrefix_RAYLET_TASK_string):]
                  for key in task_table_keys
              ]
  
              results = {}
              for task_id_binary in task_ids_binary:
                  results[binary_to_hex(task_id_binary)] = self._task_table(
                      ray.TaskID(task_id_binary))
              return results
docs: Fetch and parse the task table information for one or more task IDs.
  
          Args:
              task_id: A hex string of the task ID to fetch information about. If
                  this is None, then the task object table is fetched.
  
          Returns:
              Information from the task table.