Databricks Certified Associate Developer for Apache Spark — Question 45

Which of the following DataFrame operations is classified as a wide transformation?

Answer options

• A. DataFrame.filter()
• B. DataFrame.join()
• C. DataFrame.select()
• D. DataFrame.drop()
• E. DataFrame.union()

Correct answer: B

Explanation

The correct answer is B, DataFrame.join(), as it requires data from multiple partitions and thus qualifies as a wide transformation. In contrast, the other options are classified as narrow transformations since they do not involve shuffling data across partitions.