As of now, we can use the LoopOperator to emulate a loop that repeats the loop body a given number of times. However, this bloats the actually executed plans by the ExecutionOperators necessary to do the counting, thereby introducing performance overhead, making the optimization harder, and complicating debugging.
With the "repeat n-times" being such a recurring programming pattern (and so far the only real use case for the LoopOperator), it is worthwhile to create a dedicated RepeatLoopOperator (or similar).
From @sekruse on July 7, 2016 13:38
As of now, we can use the
LoopOperatorto emulate a loop that repeats the loop body a given number of times. However, this bloats the actually executed plans by theExecutionOperators necessary to do the counting, thereby introducing performance overhead, making the optimization harder, and complicating debugging.With the "repeat n-times" being such a recurring programming pattern (and so far the only real use case for the
LoopOperator), it is worthwhile to create a dedicatedRepeatLoopOperator(or similar).Copied from original issue: daqcri/rheem#2