Feature request : Support for Druid histograms about superset HOT 4 CLOSED

@xrmx any update for this feature? the approximate histogram feature is very important for us.

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@yinzhiqiang If it's important for you feel free to work on this. As a general rule don't expect someone else is doing the work for you for free.

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@mmcgowan can you provide more info of what you are after?

At time of ingestion you create an approxHistogramFold, you can then create metrics based on that histogram in superset.

in ingestion schema:
{ "type" : "approxHistogramFold", "name" : "hist_response_time", "fieldName" : "response_time", "resolution" : 50},

metric json spec:
{ "type" : "quantile", "name" : "hist_response_time", "fieldName" : "hist_response_time",
"probability" : 0.95 }

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