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Databricks Databricks-Certified-Associate-Developer-for-Apache-Spark-3.5 Question Answer

30 of 55.

A data engineer is working on a num_df DataFrame and has a Python UDF defined as:

def cube_func(val):

return val * val * val

Which code fragment registers and uses this UDF as a Spark SQL function to work with the DataFrame num_df?

spark.udf.register("cube_func", cube_func)

num_df.selectExpr("cube_func(num)").show()

num_df.select(cube_func("num")).show()

spark.createDataFrame(cube_func("num")).show()

num_df.register("cube_func").select("num").show()

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