presto-main/src/main/java/io/prestosql/operator/aggregation/DoubleCovarianceAggregation.java/DoubleCovarianceAggregation/input
class DoubleCovarianceAggregation:    @InputFunction
    public static void input(@AggregationState CovarianceState state, @SqlType(StandardTypes.DOUBLE) double dependentValue, @SqlType(StandardTypes.DOUBLE) double independentValue)
    {
        updateCovarianceState(state, independentValue, dependentValue);
    }