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The operator ensures the order of tuples. It collects all tuples in input until a heartbeat-punctuation is received, then it writes all collected tuples to output in the correct order. So the ordered output contains all tuples which were received after the last received heartbeat-punctuation. There has to be an operator that send an HEARTBEAT  before this operator.

Example

Assure Order Operator
ordered_output = REORDER(input) 

Remark: Renamed from AssureOrder

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