asdf2014 commented on issue #6099: Inconsistencies in the result of the quantile aggregator URL: https://github.com/apache/incubator-druid/issues/6099#issuecomment-410201965 Hi, @jacktomcat . This result is obtained because the quantile aggregator uses an approximate algorithm called `sketch`. You can find it in the Druid [doc](http://druid.io/docs/latest/development/extensions-core/approximate-histograms.html). A [parper](http://jmlr.org/papers/volume11/ben-haim10a/ben-haim10a.pdf) and [blog](https://metamarkets.com/2013/histograms/) are also available in the document to learn the algorithm deeply. BTW, there is a [Table](https://datasketches.github.io/docs/Quantiles/QuantilesAccuracy.html) Guide for Quantiles DoublesSketch Size in Bytes and Approximate Error, which might help you.
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