When optimizing SQL queries, the decisions made by the SQL compiler are heavily influenced by the optimizer's model of the database contents.
当对 SQL 查询进行优化时，SQL 编译器所做出的决定会受到优化器的数据库内容模型的重大影响。
This can happen when assumptions made by an optimizing dynamic compiler have become outdated.
当执行优化的动态编译器做出的假设已经过时时，就会发生这种情况。
The other experimental work is on our optimizing compiler.
另一个实验工作与我们在优化的编译器有关。
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