During ingestion design, a junior engineer proposes dropping rows with NULLs and casting every column to its final type before writing to the bronze table, arguing that the silver pipelines would then "just work" with no cleaning code at all. A senior engineer objects, citing the responsibilities of the medallion architecture layers. Where does this cleaning work belong, and why?
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Correct answer: In the silver layer — bronze should keep raw data as landed so it can be replayed and audited
Reference: https://docs.databricks.com/aws/en/lakehouse/medallion
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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 (D): In the silver layer — bronze should keep raw data as landed so it can be replayed and audited
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