Outline ● Motivation ● Problem formulation o Progressive Framework Pivotal Entry-based Method ● Range- based method ° Experiment ● Conclusion 2/2/2021 Topk Search(@ ICD E2013Outline  Motivation  Problem Formulation  Progressive Framework  Pivotal Entry-based Method  Range-based Method  Experiment  Conclusion 2/2/2021 TopkSearch @ ICDE2013 2/42