A migration becomes expensive when every object arrives as a separate mystery. Start
with the workload as a whole, then sort the result into three useful categories: what
can move directly, what needs adaptation, and what deserves a deliberate engineering
decision.
For this path, that means understanding SQL Server schemas, T-SQL, built-ins, dependencies, procedures, functions, and triggers. and producing Spark SQL for relational objects and Python or PySpark for procedural logic.. The
differences that could affect production behavior are surfaced while the team can still
act on them, not after they have become deployment surprises.