presto-main/src/main/java/io/prestosql/operator/aggregation/VarianceAggregation.java/VarianceAggregation/doubleInput
class VarianceAggregation:    @InputFunction
    public static void doubleInput(@AggregationState VarianceState state, @SqlType(StandardTypes.DOUBLE) double value)
    {
        updateVarianceState(state, value);
    }