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Published in:
2015 | OriginalPaper | Chapter
A Sampling-Based Framework for Crowdsourced Select Query with Multiple Predicates
Authors : Jianhong Feng, Huiqi Hu, Xueping Weng, Jianhua Feng, Yongwei Wu
Published in: Web-Age Information Management
Publisher: Springer International Publishing
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In this paper, we consider the crowdsourced select query with multiple predicates. We find that different predicates have different selectivities. An important problem is to determine a good predicate order. However it is rather hard to obtain an optimal order. To address this problem, we propose a sampling-based framework to find a high-quality order. We devise a minimum random selection method by randomly selecting the predicate sequence. Since minimum random selection randomly selects predicate permutations over predicates, which may bring large cost, we propose a filtering based algorithm to further reduce the cost. We evaluate our method using a real-world dataset. Experimental results indicate that our methods significantly reduce the monetary cost.