UDF sizer methods

You can use the following methods for UDFs that use a generic return value to set the return value for a UDF:

int sizeReturnType();
int numSizerArgs();
int sizeArgType(int n);
int sizerNumericArgPrecision(int n);
int sizerNumericArgScale(int n);
uint64 sizerStringSizeValue(int len);
uint64 sizerNumericSizeValue (int prec, int scale);
bool isSizerArgConstnat(int n);
int32 sizerGetConstantArg(int n);
virtual uint64 calculateSize();