xueyumusic opened a new pull request #3850: Aggregation of population standard variance support URL: https://github.com/apache/incubator-pinot/pull/3850 Population standard variance is a common aggregation in statistic and data analysis, and also supported in various data software, such as hive, spark, flink etc. It maybe an improvement to support it. The updates are: * add VarPopAggregationFunction and VarPopMVAggregationFunction * add VarianceTuple similar as AvgPair to hold VarianceData * update related aggregation classes * add new tests * add doc
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