code: def add_glow(doctest_namespace, spark):
      glow.register(spark, new_session=False)
      doctest_namespace["Row"] = Row
      doctest_namespace["spark"] = spark
      doctest_namespace["lit"] = functions.lit
      doctest_namespace["col"] = functions.col
      doctest_namespace["glow"] = glow
  
label_desc: Use image node_id 1 for calling a global function with example usage: add_glow(doctest_namespace, spark) without return types