AlexanderSaydakov opened a new pull request #9436: added number of bins 
parameter
URL: https://github.com/apache/druid/pull/9436
 
 
   ### Description
   
   This is to support an alternative way of obtaining a histogram from a 
Quantiles Sketch using the DoublesSketchToHistogramPostAggregator. The 
parameter "splitPoints" was made optional, and another parameter "numBins" was 
added. The new parameter is optional as well, but it has a default of 10. 
Therefore if both parameters are omitted, the post agg must produce a histogram 
with 10 equally-spaced bins between min and max values in the sketch.
   
   I am not familiar with SQL adaptors, so I did not add this feature there.
   
   - [x ] added documentation for new or modified features or behaviors.
   - [x ] added unit tests or modified existing tests to cover new code paths.
   

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