Every dashboard query against catalog.sales.orders derives the order date by calling to_date(order_ts) — an expression repeated across dozens of reports over billions of rows. The team wants the derived value computed once, at write time, and physically stored as a column of the table. Which Delta Lake feature provides this?
Reveal answer
Correct answer: A generated column: order_date DATE GENERATED ALWAYS AS (CAST(order_ts AS DATE))
Reference: https://docs.databricks.com/aws/en/delta/
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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): A generated column: order_date DATE GENERATED ALWAYS AS (CAST(order_ts AS DATE))
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