GoldenGate 12.2 支援不可見列invisible column的複製

Oracle Goldengate 12.2現在可以複製不可見列，在以前的版本中是沒有此項功能的。
示例：
在源和目標都建立一個不可見和虛擬列commission

SQL>  create table system.test_ogg
  2   (empid number, salary number, commission number INVISIBLE generated always as (salary * .05) VIRTUAL );

Table created.

SQL>  alter table system.test_ogg
  2   add constraint pk_test_ogg primary key (empid);

Table altered.

如果我們不設定set colInvisible on，則預設是看不到commission列的。
SQL> desc  system.test_ogg
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 EMPID                                              NUMBER
 SALARY   


SQL> SET COLINVISIBLE ON

SQL> desc  system.test_ogg
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 EMPID                                              NUMBER
 SALARY                                             NUMBER
 COMMISSION (INVISIBLE)                             NUMBER

源端插入一列，commission列的值基於salary欄位計算，另外，“SELECT *”不會列出不可見列
SQL> insert into system.test_ogg
  2  values
  3   (1001, 10000);

1 row created.

SQL> commit;

Commit complete.


SQL> select empid,salary,commission from system.test_ogg;

     EMPID     SALARY COMMISSION
---------- ---------- ----------
      1001      10000        500


SQL> select * from system.test_ogg;

     EMPID     SALARY
---------- ----------
      1001      10000

目標端的佇列檔案中已經有表結構資訊，即使源和目標端表結構不同，也不再需要使用sourceDefs和AssumeTargetDefs引數。
下面是日誌資訊，已經獲取到表結構資訊
2015-12-25 07:53:07  INFO    OGG-02756  The definition for table SYSTEM.TEST_OGG is obtained from the trail file.
Skipping invisible column COMMISSION in default map.
2015-12-25 07:53:07  INFO    OGG-06511  Using following columns in default map by name: EMPID, SALARY.

2015-12-25 07:53:07  INFO    OGG-06510  Using the following key columns for target table SYSTEM.TEST_OGG: EMPID.

目標端可以複製不可見列對應的資料：
SQL> select empid,salary,commission from system.test_ogg;

     EMPID     SALARY COMMISSION
---------- ---------- ----------
      1001      10000        500