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Cost-Optimal Execution of Boolean Query Trees with Shared Streams

Abstract : The processing of queries expressed as trees of boolean operators applied to predicates on sensor data streams has several applications in mobile computing. Sensor data must be retrieved from the sensors, which incurs a cost, e.g., an energy expense that depletes the battery of a mobile query processing device. The objective is to determine the order in which predicates should be evaluated so as to shortcut part of the query evaluation and minimize the expected cost. This problem has been studied assuming that each data stream occurs at a single predicate. In this work we remove this assumption since it does not necessarily hold for real-world queries. Our main results are an optimal algorithm for single-level trees and a proof of NP-completeness for DNF trees. For DNF trees, however, we show that there is an optimal predicate evaluation order that corresponds to a depth-first traversal. This result provides inspiration for a class of heuristics. We show that one of these heuristics largely outperforms other sensible heuristics, including a heuristic proposed in previous work.
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Submitted on : Thursday, January 30, 2014 - 1:11:36 PM
Last modification on : Friday, September 30, 2022 - 4:12:06 AM
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  • HAL Id : hal-00923953, version 1


Henri Casanova, Lipyeow Lim, Yves Robert, Frédéric Vivien, Dounia Zaidouni. Cost-Optimal Execution of Boolean Query Trees with Shared Streams. 28th IEEE International Parallel & Distributed Processing Symposium, May 2014, Phoenix, United States. ⟨hal-00923953⟩



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