code: def get_merge_task_options(self, merge_idx):
      return self._merge_task_options[merge_idx]
  
imports: import math
  from typing import Any, Callable, Dict, List, Optional, Tuple, TypeVar, Union
  import ray
  from ray.data._internal.dataset_logger import DatasetLogger
  from ray.data._internal.execution.interfaces import RefBundle, TaskContext
  from ray.data._internal.planner.exchange.interfaces import ExchangeTaskScheduler, ExchangeTaskSpec
  from ray.data._internal.progress_bar import ProgressBar
  from ray.data._internal.remote_fn import cached_remote_fn
  from ray.data._internal.stats import StatsDict
  from ray.data.block import Block, BlockAccessor, BlockExecStats, BlockMetadata
  from ray.data.context import DataContext
  from ray.types import ObjectRef
  from ray.util.scheduling_strategies import NodeAffinitySchedulingStrategy
label_desc: Use image node_id 2 for calling the _PushBasedShuffleStage obj's underlying member method code with example usage: obj.get_merge_task_options(merge_idx) and returns: self