重写阶段将使用四个昵称上定义的引用约束和检查约束来删除连接操作和一个UNION分支。

The rewrite phase will use the referential and check constraints defined on the four nicknames to eliminate the join operations and one of the UNION branches.

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检查每个远程操作符是否包含在理论上可由给定数据源计算的查询中的最大部分。

Check to see if each remote operator contains the maximum portion of the query that can theoretically be evaluated by a given data source.

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同样，如果忽略简单检查和验证，则移除操作实际上就是移除设计器，处置设计器，移除该组件的站点，然后处置该组件。

Again, overlooking simple checks and validation, the remove operation amounts to removing the designer, disposing the designer, removing the component's site, and then disposing the component.

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