Partitioning Data with partitionBy()

How do we define a partition-only WindowSpec to calculate departmental totals across all member rows?

Advanced⏱ 2 Minutes⭐ 560 XP

🤔 THE QUESTION

How do we define a partition-only WindowSpec to calculate departmental totals across all member rows?

💡 WHAT IS IT?

Window.partitionBy('department') creates an unordered window across all rows sharing the same department.

🎯 WHAT IS IT USED FOR?

Calculating group aggregates and percentage of department total without a GROUP BY shuffle.

💻 EXAMPLE

from pyspark.sql.window import Window

dept_window = Window.partitionBy("department")

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