说明：具有多个子查询结果列无效。
此声明包含一个对一个或多个子查询的循环引用。
The statement contains a cyclic reference to one or more sub queries.
根据映射定义，联合服务器将联合查询拆分为多个子操作。
According to the mapping definition, the federation server breaks down the federated query into multiple sub operations. Multiple factors influence this step.
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