作为转换的一部分，优化器还决定正确的表联接顺序，重写表达式，并从SQL中消除任何冗余。
As part of the transformation, the optimizer also determines the correct table join order, rewrites expressions, and eliminates any redundancy from the SQL.
典型的编译器最优化，如死代码消除、常数合并、常数传送、部分冗余的消除、循环展开等等，是静态分析。
The cla ic compiler optimizatio, such as dead co de elimination, co tant folding, co tant propagation, elimination of partial redundancies, loop unrolling, etc. , are static analyses.
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