leerho commented on issue #6581: Moments Sketch custom aggregator URL: https://github.com/apache/incubator-druid/pull/6581#issuecomment-460527422 I just completed a comparative analysis of the Druid [Approximate Histogram](https://datasketches.github.io/docs/Quantiles/DruidApproxHistogramStudy.html), the [Moments Sketch](https://datasketches.github.io/docs/Quantiles/MomentsSketchStudy.html), and the [DS-Quantiles](https://datasketches.github.io/docs/Quantiles/QuantilesStreamAStudy.html) sketch against some actual time-spent data we collected from one of our servers. You might want to take a look. This data has a well-behaved and smooth distribution so any reasonable quantile or histogram tool should be able to handle it without any issues.
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