A two-phase stratified sampling framework for index-assisted online aggregation optimizes strata using first-phase samples and proves allocation strategies, yielding up to 3x speedup over uniform sampling.
Youngs and Elliot M
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Index-Assisted Stratified Sampling for Online Aggregation
A two-phase stratified sampling framework for index-assisted online aggregation optimizes strata using first-phase samples and proves allocation strategies, yielding up to 3x speedup over uniform sampling.