--innodb-instant-alter-column-allowed

This is a command-line option for the mariadbd & mysqld commands (arg: Required).

In 10.5 ES, 10.5 CS, 10.4 ES, 10.4 CS:

File format constraint for ALTER TABLE. One of: never, add_last, add_drop_reorder

In 10.3 ES, 10.3 CS:

File format constraint for ALTER TABLE. One of: never, add_last

In 10.2 ES, 10.2 CS:

Not present

See also: Options for mariadbd & mysqld in 10.5 ES, in 10.5 CS, in 10.4 ES, in 10.4 CS, in 10.3 ES, in 10.3 CS, in 10.2 ES, and in 10.2 CS