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The feature engineering overview said that every mechanism separates declaring from filling and that every refresh leaves current rows alone. That holds for computed columns only: creating a materialized view computes its rows, and a local refresh replaces the whole view even when nothing changed. The overview now compares the two, keeps the incremental explanation for computed columns, explains the view lifecycle with its deployment qualification, and says that a deployment does not refresh a computed column by itself. Its chooser lists Geneva for Python work until Functions launch.