15.11

Suppose a query retrieves only the first \(K\) results of an operation and terminates after that. Which choice of demand-driven or producer-driven pipelining (with buffering) would be a good choice for such a query? Explain your answer.

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Demand driven is better, since it will only generate the top \(K\) results. Producer driven may generate a lot more answers, many of which would not get used.