An example of the operation on the server is shown below.

Change a masking policy
Execute the pgx_alter_confidential_policy system management function to change a masking policy.
The following values are changed in this example.
- Content of change: Add a masking target
- Masking target: Character type c2
- Masking type: PARTIAL
- Masking condition: 'VVVFVVVVFVVVV, VVV-VVVV-VVVV, *, 4, 11'

postgres=# select pgx_alter_confidential_policy(table_name := 't1', policy_name := 'p1', action := 'ADD_COLUMN', column_name := 'c2', function_type := 'PARTIAL', function_parameters := 'VVVFVVVVFVVVV, VVV-VVVV-VVVV, *, 4, 11');
 pgx_alter_confidential_policy 
--------------------------------
 t
(1 row)

Confirm the displayed data
Confirm that the masking target data has been correctly changed.

postgres=# select * from t1;
 c1 |      c2       
----+---------------
  0 | 012-****-****
  0 | 012-****-****
  0 | 012-****-****
(3 row)