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- This operator has a more flexible PQL interface that allows to specify key value parameters.
- This operator does not set end timestamps of the resulting data stream elements. If you need the validity of the aggregation value you need to append an element window of size 1.
- This operator outputs "empty aggregations" if no tuple is valid at a specific point in time. E.g., the sum aggregation function would output 0. This is necessary to determine the end timestamp with a subsequent element window.
This These aggregation functions are still in development. Especially the keys for the parameters are preliminary and subject to change.
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