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val metrics = exptRows
.flatMap { case (exptRow) =>
metrics.flatMap { case (metric) =>
generateStatisticsObjects(metric, exptRow) // stats objects keyed by (experiment, metric, bucket)
}
}
.reduceByKey(_ combine _) // combine is a custom-defined aggregator function which mostly just sums various properties
.mapValues(statisticsObjectToMetric)
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