code: def utf8_decoder(s: Optional[bytes]) -> Optional[str]:
      """Decode the unicode as UTF-8"""
      if s is None:
          return None
      return s.decode("utf-8")
  
file_path: spark/python/pyspark/streaming/kinesis.py
imports: from typing import overload, Callable, Optional, TypeVar, Union
  from pyspark.serializers import NoOpSerializer
  from pyspark.storagelevel import StorageLevel
  from pyspark.streaming import DStream
  from pyspark.streaming.context import StreamingContext
  from pyspark.util import _print_missing_jar
label_desc: Use image node_id 1 for calling a global function with example usage: utf8_decoder(s) and returns: s, None