Looking Ahead to Next Steps with lead()

How do we look forward to the next page visited in a web clickstream session using lead()?

Advanced⏱ 3 Minutes⭐ 660 XP

🤔 THE QUESTION

How do we look forward to the next page visited in a web clickstream session using lead()?

💡 WHAT IS IT?

lead(col, offset).over(windowSpec) retrieves the value from offset rows ahead of the current row.

🎯 WHAT IS IT USED FOR?

Funnel conversion analysis, next-best-action modeling, and user click path attribution.

💻 EXAMPLE

from pyspark.sql.window import Window
from pyspark.sql.functions import col, lead

window_spec = Window.partitionBy("session_id").orderBy("step_number")
df = df.withColumn("next_page_id", lead(col("page_id"), 1).over(window_spec))

🎯 Mission Objectives

Practice typing production-grade PySpark code for Looking Ahead to Next Steps with lead().

✓ Import lead function
✓ Fetch subsequent page ID in user session
✓ Enable web funnel transition tracking

🚀 Start Mission

← Prev (Fetching Prior Row Values with lag())Next Lesson (Cumulative Running Totals with Window Frames) →