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.
Rico在初始装载期间取出150行数据，并使用缓冲区存储该数据。
Rico fetched 150 rows of data during the initial load and used buffering to store the data.
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