把该查询提交给SQL编译器之后，语义阶段展开视图定义，并将它合并到初始的查询中，如下所示。
After the query is submitted to the SQL compiler, the semantics phase expands the view definition and merges it into the original query as shown below.
使用 JIT 编译器的初始阶段性能很低，因为要首先解释方法。
Performance with a JIT compiler is initially very low because methods are initially interpreted.
第二种情况是，类型具有一个用于静态字段的初始值设定项，在这种情况下，编译器会在后台添加类型构造函数。
The second scenario is when a type has a initializer for a static field, in which case the compiler adds a type constructor behind the scenes.
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