使用基于结构的IO方法时，RPG将为输入和输出缓冲区创建初始存储空间，并为空指示符映射创建存储空间。
When using the structure based IO method, RPG will create the initial storage for the input and output buffers, along with storage for the null indicator map.
当您在创建一个子工作区时，仍然没有数据被复制，在数据库中有一个指示符表示可以使用子工作区，而其内容被设置为读/写。
When a child Workspace is created, again no data is duplicated, there is simply an indicator in the database that a child Workspace is available, and that its content is set to read/write.
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