While the agents are busy doing steps 3 and 4 above, the union operator (run by the coordinator agent) starts reading data from the SHIP buffer on the first leg of the union.
当代理正在执行上述步骤3和步骤4时，UNION操作符(由协调代理程序运行)开始从UNION的第一个分支上的ship缓冲区中读取数据。
While the agents are busy doing steps 3 and 4 above, the union operator (run by the coordinator agent) starts reading data from the SHIP buffer on the first leg of the union.
当代理正在执行上述步骤3和步骤4时，UNION操作符(由协调代理程序运行)开始从UNION的第一个分支上的ship缓冲区中读取数据。
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