UDX arguments

You can use the following argument types in your UDX code:

StringArg* stringArg(int n)
float floatArg(int n)
double doubleArg(int n)
int argType(int n)
int numArgs()
int stringArgSize(int n)
int64 int64Arg(int n)
int32 int32Arg(int n)
int16 int16Arg(int n)
bool isArgNull(int n)