Change the name and attributes of the confidentiality levels that were added to the confidentiality matrix 'matrix_foo' as follows. Specify the value after changing the name and attributes in JSON format. You can change the name or multiple attributes at once. Attributes not specified here are not changed.

select pgx_alter_confidential_level('matrix_foo', 'level1', '{"name": "levelX", "comment":"This level required the highest confidential clearance."}')

If a confidentiality object was already registered with the confidentiality level, the attributes of the confidentiality object are also changed automatically. However, as mentioned in "7.2.1.1 Defining Confidentiality Levels", it may not be possible to automatically change the attributes of confidentiality objects. At that time, the function checks that the attributes of the registered confidentiality object are stricter than the attribute of the modified confidentiality level. If the check fails, this function will also fail. For example, if you try to change the encryption_algorithm from AES128 to AES256 and an AES128 encrypted table is registered as a confidentiality object, this function will fail. In such a case, please execute this function again after encrypting the table with AES256.