ATQ 操作符的消费者可以每次从 ATQ 缓冲区中读取一行数据。
The consumer of the ATQ operator can read data one row at a time from the ATQ buffer.
UNION 操作符每次使用 SHIP 缓冲区中的一行数据，并将这行数据通过 RETURN 操作符上传到应用程序。
The UNION operator consumes the data a row at a time from the SHIP buffer and flows the row upwards to the application through the RETURN operator.
例如，如果加载之后所有数据都在一个分区上，并从另一分区执行runstats，那么该命令将更新syscat . tables来表示该表的行数为零。
For example, if after a load all the data is on one partition and runstats is executed from another partition, it will update syscat.tables to show zero rows for that table.
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