Check out example codes for "pyspark udf multiple inputs". It will help you in understanding the concepts better.

Code Example 1

from pyspark.sql.types import IntegerType
from pyspark.sql.functions import udf

def sum(x, y):
    return x + y

sum_cols = udf(sum, IntegerType())

a=spark.createDataFrame([(101, 1, 16)], ['ID', 'A', 'B'])
a.withColumn('Result', sum_cols('A', 'B')).show()

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