exec
CREATE TABLE t (i INT PRIMARY KEY)
----

create f=1
t
----

exec
ALTER TABLE t ADD COLUMN j INT;
----

pop f=1
----
t 1->2: Unknown
t 2->3: Unknown
t 3->4: AddColumnNoBackfill

exec
ALTER TABLE t ADD COLUMN k INT DEFAULT 42;
----

pop f=1
----
t 4->5: Unknown
t 5->6: Unknown
t 6->7: Unknown
t 7->8: Unknown
t 8->9: Unknown
t 9->10: AddColumnWithBackfill|PrimaryKeyChange
t 10->11: Unknown
t 11->12: Unknown

exec
SET use_declarative_schema_changer=off;
ALTER TABLE t ADD COLUMN l INT NOT NULL DEFAULT 42;
----

pop f=1
----
t 12->13: Unknown
t 13->14: Unknown
t 14->15: AddColumnWithBackfill
