然后这些算子链在一起以便执行复杂的函数。
These operators are then chained together in order to perform complex functions.
现在可使用清单4中的命令将策略应用到对象上以便执行。
Now you can use a command like the one in Listing 4 to attach the policy to the object for enforcement.
另外还配置联邦系统，以便执行高效的本地连接和排序操作。
Also configure the federated system to perform efficient local join and sort operations.
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