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Overview. Sketch based algorithmsCompressionSelectivity estimationTransformations/Synonyms. 2. Selection Queries Using Sketch Based Algorithms. What is a Sketch. An approximate representation of the stringWith size much smaller than the stringThat can be used to upper bound similarity(or lower bound the distance)String s has sketch sig(s)If Simsig(sig(s), sig(t)) < ?, prune tAnd Simsig is much more efficient to compute than the actual similarity of s and t.

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