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PYSPARK โ€ข LESSON 147

Explicit Return Types with Lambda UDFs

How do we define an inline lambda UDF with explicit DoubleType return type for tax calculations?

Expertโฑ 2 Minutesโญ 770 XP
๐Ÿค” THE QUESTION

How do we define an inline lambda UDF with explicit DoubleType return type for tax calculations?

๐Ÿ’ก WHAT IS IT?

udf(lambda, returnType) creates a callable Column UDF from an inline Python lambda function.

๐ŸŽฏ WHAT IS IT USED FOR?

Quick custom numerical computations, non-linear scoring, and custom rate calculators.

๐Ÿ’ป EXAMPLE
from pyspark.sql.functions import udf
from pyspark.sql.types import DoubleType

calculate_tax_udf = udf(lambda amount, rate: float(amount * rate), DoubleType())

๐ŸŽฏ Mission Objectives

Practice typing production-grade PySpark code for Explicit Return Types with Lambda UDFs.

  • โœ“ Import udf and DoubleType
  • โœ“ Define multi-argument lambda UDF
  • โœ“ Specify explicit DoubleType return contract