[GitHub] [incubator-druid] himanshug opened a new pull request #8459: doubleMean aggregator to be used at query time

[GitBox <gi...@apache.org>]

himanshug opened a new pull request #8459: doubleMean aggregator to be used at query time
URL: https://github.com/apache/incubator-druid/pull/8459
 
 
   Fixes  #8071
   
   ### Description
   This patch introduces `doubleMean` aggregation type to compute arithmetic mean of values in a column at query time.
   
   it works by keeping `sum` and `count` and in the end spitting `sum/count` as mean.
   
   I explored an alternate algorithm as mentioned in #8071 but did not implement that due to performance degradation observed. That could be added in future as a optional strategy in this aggregation type.
   
   <hr>
   
   This PR has:
   - [X] been self-reviewed.
   - [X] added documentation for new or modified features or behaviors.
   - [X] added unit tests or modified existing tests to cover new code paths.
   
   <hr>
   
   ##### Key changed/added classes in this PR
   All the `*Aggregator*.java` classes and `DoubleMeanHolder`
   

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