Before promoting a new PySpark transformation into the nightly production job, an engineer wants to see what Spark intends to do with it — the planned join strategy, the filters, and the projection — without spending cluster resources actually running the query. Which action gives her this preview?
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Correct answer: Call df.explain() to print the logical and physical plans without executing anything
Reference: https://docs.databricks.com/aws/en/pyspark/reference
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02 — The Myelin Layer · Canonical Discussion
Where the exam tries to trick you — and how those who passed solved it.
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Official Answer (C): Call df.explain() to print the logical and physical plans without executing anything
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