[Bug]druid Approximate Histogram post-aggregations

[fangyeqing]

@bkyryliuk When I use this feature, I found a bug :
Support more druid postaggregations#2235

• I have checked the superset logs for python stacktraces and included it here as text if any
• I have reproduced the issue with at least the latest released version of superset
• I have checked the issue tracker for the same issue and I haven't found one similar

Superset version

source code version: 9d8d421

Steps to reproduce

Step 1. At Druid's ingestion time

"approxHistogramFold" aggregator is created as follows:

{
          "type" : "approxHistogramFold",
          "name" : "rsp_time",
          "fieldName" : "rsp_time",
          "resolution" : 500,
          "numBuckets" : 500,
          "lowerLimit" : 0.0
}

Step 2. Create Druid Metrics in Superset

Metrics NO1: "approxHistogramFold" aggregator

Metrics NO.2: post-aggregators

Step 3.Query in Superset

When choose both post-agg response_0.99 and approxHistogram-aggregator rsp_time, you can get the right result

But, when only choose post-agg response_0.99,

HTTP Error 500: Server Error Druid Error: None Query is: { "aggregations": [], "intervals": "2017-02-27T18:40:21+00:00/2017-03-06T18:40:21+00:00", "dataSource": "adtime_stat", "granularity": "all", "postAggregations": [ { "fieldName": "rsp_time", "type": "quantile", "name": "response_0.99", "probability": 0.99 } ], "queryType": "timeseries" }

Because to query for results, an "approxHistogramFold" aggregator must be included in the query，we can see the official doc for details

Bug fix

#2345

Others

When I create a "quantiles"post-agg

Then I send a query request, and I get Object object, it's hard to read

I think the display of "quantiles"post-agg can be more readable

PR

#2346

[mistercrunch]

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