HIVE-16605 is enabling/enforcing NOT NULL constraint. But since Hive do not manage the data for external tables and can not enforce constraints it doesn't make sense to allow NOT NULL constraints to be enabled/enforced on external table.
User can still specify RELY to signal optimizer for constraint related optimizations.
HIVE-16605 Enforce NOT NULL constraints
- relates to
HIVE-26130 Incorrect matching of external table when validating NOT NULL constraints
- In Progress