显然，它应该防止无限循环，而且它应该检测以前装载的对象并通过重用这些对象来节省时间。
Obviously, it should prevent never-ending loops, and it should detect previously loaded objects and save time by reusing them.
不要通过重新装载表定义覆盖db 2stage中的输入列，否则前面X ML输入stage中的XPath将丢失。
DO NOT override the input columns in DB2 stages by reloading table definitions, otherwise the XPath in the foregoing XML input stage will be lost.
不要通过重新装载表定义覆盖db 2stage中的输入列，否则前面X ML输入stage中的XPath将丢失。
DO NOT override the input columns in DB2 stages by reloading table definitions, otherwise the XPath in the foregoing XML input stage will be lost.
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