You can add filters in Tableau Prep. Why not do it before writing the data to an extract?
Can you please provide more information on what you want to achieve?
Do you want to filter the data source before starting your Prep flow?
If that is the case you can use filters in the Data connection step. As you put the mouse on the field you want to create the filter you will see Add Filter button. The filters will be always boolean calculations.
I hope this helps
He's talking about a datasource filter that would filter based on a calculation that checks if a user is a member of a tableau server group. eg ISMEMBEROF('group name')
Or you could filter the data based on a parameter selection. You'd have the entire data set included when coming out of prep, but then filter only in Tableau based on a calculation.
Nigel Fung I don't see this as being an option unfortunately. I was looking for the same thing. Eg. ISMEMBEROF is not a calculation option in Prep.