Oracle 12c 新特性 invisible column Tips

HR@PDB1> create table tab_invisible(col1 varchar2(10),col2 number, col3 varchar2(10) invisible);
	Table created.
HR@PDB1> desc tab_invisible
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 COL1                                               VARCHAR2(10)
 COL2                                               NUMBER

HR@PDB1> set colinvisible on
HR@PDB1> desc tab_invisible
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 COL1                                               VARCHAR2(10)
 COL2                                               NUMBER
 COL3 (INVISIBLE)                                   VARCHAR2(10)

HR@PDB1> 
HR@PDB1> insert into tab_invisible values('aaaaa',1);
1 row created.
HR@PDB1>
HR@PDB1> insert into tab_invisible values('aaaaa',1,'invisible');
insert into tab_invisible values('aaaaa',1,'invisible')
		   *
ERROR at line 1:
ORA-00913: too many values
HR@PDB1> 
HR@PDB1> insert into tab_invisible(col1,col2,col3) values('aaaaa',1,'invisible');
1 row created.
HR@PDB1>

HR@PDB1> alter table tab_invisible modify (col3 visible);
Table altered.
HR@PDB1> desc tab_invisible;
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 COL1                                               VARCHAR2(10)
 COL2                                               NUMBER
 COL3                                               VARCHAR2(10)
HR@PDB1>