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By setting a new optional parameter, `errorBoundsStdDev`, to the number of standard deviations to use when computing error bounds, the return type for both the SketchMergeAggregator and the SketchEstimate PostAggregator can be changed from a simple double (estimate) to a JSON object containing the estimate, expected high bound, expected low bound, and standard devations used when computing bounds (same value as passed in).
This module provides druid aggregators based on http://datasketches.github.io/ .
Credits: This module is a result of feedback and work done by following people.
https://github.com/cheddar https://github.com/himanshug https://github.com/leerho https://github.com/will-lauer