ALTER NAMED COLLECTION

ALTER NAMED COLLECTION [IF EXISTS] name [ON CLUSTER cluster]
[ SET
key_name1 = 'some value' [[NOT] OVERRIDABLE],
key_name2 = 'some value' [[NOT] OVERRIDABLE],
key_name3 = 'some value' [[NOT] OVERRIDABLE],
... ] |
[ DELETE key_name4, key_name5, ... ]

CREATE NAMED COLLECTION foobar AS a = '1' NOT OVERRIDABLE, b = '2';

ALTER NAMED COLLECTION foobar SET a = '2' OVERRIDABLE, c = '3';

ALTER NAMED COLLECTION foobar DELETE b;