поставил Табло 2020.3
нашел такую новую фичу
Infer Properties from Missing Values.
But this isn’t enough to let you make predictions on those generated marks. If you tried to perform a calculation on them (whether that’s a prediction calculation or not), Tableau would return null values. This is expected, since those marks are based on missing values that don’t exist.
To make predictions on those missing values, open the Analysis menu at the top, and then select Infer Properties from Missing Values.