当执行预编译语句时，IDS检测底层对象的变化，必要时重新准备(重新编译)语句。
When you execute a prepared statement, IDS now detects changes to underlying objects and re-prepares (re-compiles) the statement if needed.
为了提供一种方法来检测失败的xi： include语句，XInclude规范提供了fallback语句。
To provide a way to detect a failed xi: include statement, the XInclude specification provides the fallback statement.
重写阶段会检测这些冗余，并简化语句。
The rewrite phase detects these and simplifies the statement.
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