For those processors that have an explicit compile phase, use-when filtering is intended to avoid compiling blocks of code that the processor couldn't execute.
对于那些具有明确编译阶段的处理程序，use -when筛选通常可以避免编译那些处理程序不能执行的代码块。
For instance, if the attempt to compile a program fails due to unresolved symbols, it's possible that an earlier phase of the build process did something wrong!
举例来说，如果试图编译程序时由于存在无法解析的符号而失败了，那么就可能是编译过程前面某个步骤出现了问题！
Better UNION handling in the compile and optimization phase of the access plan.
在访问计划的编译和优化阶段提供更好的UNION处理。
The advantage of compiled phase and run phase compile only once in the whole process.
编译阶段和运行阶段分开的好处使得整个过程只编译一次。
The advantage of compiled phase and run phase compile only once in the whole process.
编译阶段和运行阶段分开的好处使得整个过程只编译一次。
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