It's proved that the two-layer framework is available, feasible and can be easily realized in practices.
测试表明，该两层框架是可行的、有效的，且易于实现。
The Dynamic Query Mode only has two major components, the transformation layer, and the execution layer, although there are supporting components like the metadata framework etc.
Dynamic Query Mode 仅有两个主要组件，transformation layer 和 execution layer，不过还有元数据框架等配套组件。
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