presto-main/src/main/java/io/prestosql/operator/scalar/QuantileDigestFunctions.java/QuantileDigestFunctions/verifyAccuracy
class QuantileDigestFunctions:    public static double verifyAccuracy(double accuracy)
    {
        checkCondition(accuracy > 0 && accuracy < 1, INVALID_FUNCTION_ARGUMENT, "Percentile accuracy must be exclusively between 0 and 1, was %s", accuracy);
        return accuracy;
    }