code: def spark_df(spark):
      """Create spark dataframe."""
      schema = StructType(
          [
              StructField("a", IntegerType(), True),
              StructField("Bell__Chart", FloatType(), True),
              StructField("decorated-elephant", IntegerType(), True),
              StructField("animals@#$%^", StringType(), True),
              StructField("cities", StringType(), True),
          ]
      )
      return spark.createDataFrame([], schema)
  
label_desc: Use image node_id 2 for calling a global function with example usage: spark_df(spark) and returns: spark