By default, the source operator caches its input feed for an hour.
默认情况下，source操作符缓存其输入数据源一个小时。
Connect the Start operator to the input of the first data flow operator.
把Start操作符连接到第一个数据流操作符的输入。
This operator also serves as input to the Group By operator.
该操作符还充当GroupBy操作符的输入。
This operator also serves as input to the Group By operator.
该操作符还充当GroupBy操作符的输入。
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