According to the mapping definition, the federation server breaks down the federated query into multiple sub operations. Multiple factors influence this step.

根据映射定义，联合服务器将联合查询拆分为多个子操作。

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For the -opt, -neg and -join operations, multiple-named variables may be listed in the token, for example, {-opt|/|foo,bar,baz}.

对于 -opt、-neg和-join操作，可以在标记中列出多个指定变量。例如，{-opt|/|foo,bar,baz}。

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For the users, the BREW is a platform that provides simple operations, multiple functions and convenient customizations.

对于用户来说，BREW是一个能够为他们提供简单操作、功能多样、方便定制的平台。

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For the users, the BREW is a platform that provides simple operations, multiple functions and convenient customizations.

对于用户来说，BREW是一个能够为他们提供简单操作、功能多样、方便定制的平台。

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