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Data & Analytics · Intermediate

Lazy Evaluation

Deferring execution of transformations until an action requires a result, which lets the engine optimize the whole plan.

Definition

Spark and Snowpark build a logical plan from transformations and execute only when an action such as count(), collect(), show() or write runs.

Exam tip

Nothing runs in Spark until an action is called; a chain of transformations alone triggers no job.

Related terms