D — Driver

Rules that flag operations which pull data from the distributed cluster to the driver node. These are the most dangerous antipatterns — they can silently OOM the driver or stall a pipeline entirely.

Rule	Title
D001	Avoid using collect()
D002	Avoid accessing .rdd
D003	Avoid .show() in production
D004	Avoid .count() on large DataFrames
D005	Avoid .rdd.isEmpty() — use .isEmpty() directly
D006	Avoid df.count() == 0 — use .isEmpty()
D007	Avoid .filter(...).count() == 0 — use .filter(...).isEmpty()
D008	Avoid .display() in production
D009	Avoid .count() as a boolean — use .isEmpty()