The extract request contains the metadata about the selected source database tables.
该提取请求包含关于选择的源数据库表的元数据。
The federation server forward for each request that it receives sub-operations to source systems.
联合服务器会将其接收到的每个请求的子操作转发到源系统。
The extract request generates a detailed report about the extracted source data.
提取请求生成一个关于提取的源数据的详细报告。
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