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• Set eval_at_new_element to false and eval_before_remove_outdating to true and add a preceding window with advance.

Remark: In this case, the starttimestamp of the output gets the timestamp of the value, that triggers the output (i.e. the element that states, that the current elements are outdated).

The following example calculates the number of elements in the stream impressions in one minute. It outputs the total number at the end of each minute instead of each update when a new item arrives.

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