文档解释
ORA-02339: invalid column specification
Cause: An attempt was made to specify the PACKED or UNPACKED keyword for a non-object type column.
Action: Remove the PACKED or UNPACKED keyword in the column specification and retry the operation.
ORA-02339错误是由于列定义无效引起的，官方解释如下：
ORA-02339: invalid column specification
Cause: The column definition in the CREATE TABLE statement is either incomplete or incorrect.
Action: Check the syntax of the column definition.
