Column Referencing with col()

Why and how do we use the col() function to reference DataFrame columns as first-class objects?

Beginner⏱ 2 Minutes⭐ 175 XP

🤔 THE QUESTION

Why and how do we use the col() function to reference DataFrame columns as first-class objects?

💡 WHAT IS IT?

col() creates a Column object enabling programmatic operations, method chaining, expressions, and type safety.

🎯 WHAT IS IT USED FOR?

Writing robust, refactorable transformation pipelines that support method chaining and arithmetic.

💻 EXAMPLE

from pyspark.sql.functions import col

df.select(col("order_id"), col("amount")).show()

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