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Having the heading "aggregation" under streaming operators is confusing. Not all aggregations are covered here. I suggest that we change the heading to "Non-blocking Aggregation Operators" to make it clear that we are considering the specific set of operators that can be applied over a stream.
An issue that may arise is if the processing of a query does not start at the same time as the stream. The result of such a query could be wrong. The answer to such a query should include meta information about when the processing was commenced.