图4展示了一个在联邦服务器使用嵌套循环连接操作符来计算这个查询的计划。

Figure 4 shows a plan using the nested loop join operations at the federated server to evaluate this query.

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可以根据连接操作符的细节判断连接的类型(INNER、RIGHT或LEFT)。

You can tell the type of join (INNER, RIGHT, or LEFT) by the details of the join operator.

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和UNION操作符一样，连接操作符本身是同步的，每次只能处理来自连接操作符某一个分支的输入。

As with the UNION operator, the join operator itself remains synchronous and is only able to process input from one leg of the join at a time.

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