ALTER TABLE testschema."table_2_$%{}[]()&*^!@""'`\/#"
    ADD COLUMN "col_2_$%{}[]()&*^!@""'`\/#" character varying(50, None) COLLATE pg_catalog."C" DEFAULT None;

COMMENT ON COLUMN testschema."table_2_$%{}[]()&*^!@""'`\/#"."col_2_$%{}[]()&*^!@""'`\/#"
    IS 'Comment for create';