presto-main/src/main/java/io/prestosql/operator/scalar/MathFunctions.java/MathFunctions/inverseBetaCdf
class MathFunctions:    @Description("inverse of Beta cdf given a, b parameters and probability")
    @ScalarFunction
    @SqlType(StandardTypes.DOUBLE)
    public static double inverseBetaCdf(
            @SqlType(StandardTypes.DOUBLE) double a,
            @SqlType(StandardTypes.DOUBLE) double b,
            @SqlType(StandardTypes.DOUBLE) double p)
    {
        checkCondition(p >= 0 && p <= 1, INVALID_FUNCTION_ARGUMENT, "p must be 0 >= p >= 1");
        checkCondition(a > 0 && b > 0, INVALID_FUNCTION_ARGUMENT, "a, b must be > 0");
        BetaDistribution distribution = new BetaDistribution(null, a, b, BetaDistribution.DEFAULT_INVERSE_ABSOLUTE_ACCURACY);
        return distribution.inverseCumulativeProbability(p);
    }