Please note this only affects data cache (tuple storage) and not metadata cache.
请注意这只会影响数据缓存（元组存储）且没有元数据缓存。
The ROW data type can be equated to a table definition: it defines multiple columns that are grouped together into a tuple.
ROW数据类型可以等同于一个表定义：它定义可以组成一个元组的多个列。
In this case, you iterate through the contents of the recv aggregate, sum the packet lengths for each tuple (device name, PID, and process name), then emit this data.
在本例中，您将遍历recv聚合的内容、为每个元组(设备名、PID和进程名)相加包的长度，然后发出该数据。
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