I have a Fact table based on a View. Rather than create a Calculated Measure in the front-end BI application (Tableau), I decided to alter the View to include an extra column based on a CASE statement.
It occurred to me subsequently that I could have left the View untouched and instead replaced the View with a Named Query in the Data Source View.
My question is: which method is preferred? Does it depend on data volumes?
I know that you can't use Named Queries in a DSV if the cube storage mode is ROLAP, but that's not an issue because I'm using MOLAP.
Personally, I prefer to create the columns in the view. This means that all applications using the view can use the same definition. Otherwise you may need to create an equivalent value in every application that needs it.
Another reason is that the DSV editor is not real special and will reformat your named query to suit itself. This doesn't help with readability of the query.