presto-main/src/main/java/io/prestosql/type/DecimalCasts.java/DecimalCasts/longDecimalToDouble
class DecimalCasts:    @UsedByGeneratedCode
    public static double longDecimalToDouble(Slice decimal, long precision, long scale, BigInteger tenToScale)
    {
        return DecimalConversions.longDecimalToDouble(decimal, scale);
    }