The difference in execution plans is shown in Figure 3.
执行计划的差别如图 3 所示。
Next, the middle HSJOIN would cause execution of SHIPs 3 and 4 in sequence, after which the join result would be delivered to the UNION.
接着，中间的HSJOIN将导致SHIP 3和SHIP 4依次执行，然后连接结果被提交给UNION。
Use Step 3 to calculate n, the number of task executions whose cumulative execution time is sufficiently large.
使用步骤3计算n，这是执行task的次数，这些次执行的累计时间必须足够大。
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