Perhaps the most user-visible InnoDB changes in the MariaDB Server 10.3.7 GA release are Instant ADD COLUMN for InnoDB tables, the new parameter alter_algorithm and the clauses
ALGORITHM=NOCOPY that can protect the database from executing costly
ALTER TABLE operations taking hours.
Upgrade to MariaDB Server 10.3.7, and enjoy the instant
ADD COLUMN with your old InnoDB data files.