当在会话中第一次引用时，全局变量将进行实例化来获得其默认值。
A global variable is instantiated to its default value when it is first referenced in the session.
如果在没有使用模式名情况下引用全局变量，则使用SQL路径协助解析名称。
When a global variable is referenced without the schema name, the SQL path is used to assist in the name resolution.
它还会创建一个引用SPE程序的全局变量，这样ppe就能够将程序加载到SPE中并根据需要来运行程序了。
It also creates a global variable that refers to the SPE program so that the PPE can load the program into the SPEs and run the program as needed.
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