The UNION operator reads data from each SHIP buffer, one buffer at a time. The sequence of operations is as follows
而 UNION 操作符则从每个 SHIP 缓冲区中读取数据，每次读取一个缓冲区。
Jobs never run out of sequence, and if a job fails, the TWS handles the recovery process with little or no operator intervention.
作业永远不会打破顺序运行，并且如果一个作业失败了，TWS可以在操作员少量参予甚至不参予的情况下对之进行恢复。
Because the operator returns its left-hand operand, we can combine a sequence of input requests into a single statement.
由于输入操作符返回其左操作数，我们可以将输入请求序列合并成单个语句。
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