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Percentile calculations with Druid


Hi,

I wanted to know which algorithm/s druid uses to compute percentile values.
I came across this doc:
http://druid.io/docs/latest/development/extensions-core/approximate-histograms.html
but it mentions that there are "no formal error bounds on the
approximation". So, just want to know what all options are available if one
wishes to compute percentiles?

Thanks in advance.