Auth ID about DDL language in Dynamic SQL

1)Auth ID about DDL language in Dynamic SQL
1@@@@with AUTHID CURRENT_USER option
HR@ocm> !cat tmp.sql
CREATE OR REPLACE PROCEDURE exec_DDL
    (  ddl_string  IN  VARCHAR2 )
AUTHID CURRENT_USER
IS
BEGIN
  EXECUTE IMMEDIATE ddl_string; --Who is the table belong to
  --sh create a table using this procedure,
  --check who is that table belong to !!!
END;
/
HR@ocm> @tmp.sql
Procedure created.

HR@ocm> GRANT execute ON exec_DDL TO sh; 
Grant succeeded.

@@@login by sh, check
SH@ocm> EXEC hr.exec_DDL('CREATE TABLE who_am_I_belong_to(a int)');
PL/SQL procedure successfully completed.
SH@ocm> set lines 60
SH@ocm> desc who_am_I_belong_to
 Name                   Null?    Type
 ----------------------------- -------- --------------------
 A                    NUMBER(38)
HR@ocm> desc who_am_I_belong_to
ERROR:
ORA-04043: object who_am_I_belong_to does not exist

@@@Summary:
   obviously, who is calling the procedure, the object is belong to who use the DDL to create it
   When you use AUTHID CURRENT_USER before IS keyword.
   this option is that running the code in this plsql object by the current user.
   No matter who the plsql is belong to.



2@@@@without AUTHID CURRENT_USER option
HR@ocm> !cat tmp.sql
CREATE OR REPLACE PROCEDURE exec_DDL
    (  ddl_string  IN  VARCHAR2 )
IS
BEGIN
  EXECUTE IMMEDIATE ddl_string; --Who is the table belong to
  --sh create a table using this procedure,
  --check who is that table belong to !!!
END;
/
HR@ocm> @tmp.sql
Procedure created.

HR@ocm> GRANT execute ON exec_DDL TO sh;
Grant succeeded.


@@@login by sh, check
SH@ocm> EXEC hr.exec_DDL('CREATE TABLE who_am_I_belong_to(a int)');
BEGIN hr.exec_DDL('CREATE TABLE who_am_I_belong_to(a int)'); END;
*
ERROR at line 1:
ORA-01031: insufficient privileges
ORA-06512: at "HR.EXEC_DDL", line 5
ORA-06512: at line 1

@@@Summary
   without AUTHID CURRENT_USER option, you could not use it.
   Note: default option is AUTHID DEFINER, here it is