The query compiler performs two major categories of rewrite
查询编译器主要可以执行两种类型的重写
The query compiler uses these characteristics and restrictions when planning the query.
当计划查询时，查询编译器使用这些特征和约束。
When the query is submitted, its syntax and semantics are analyzed by the query compiler.
当提交该查询时，查询编译器会分析它的语法和语义。
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