Hello!
Tableau is a report generation tool which does not store data, so, it is not possible to connect the Tableau as data source (As there is no data to source), but, if you were looking to connect the Denodo as data source on Tableau you can use the embedded data source option “Denodo” on tableau (from 10.4 onwards).
you can refer the KB article [How to connect to Denodo from Tableau Desktop](https://community.denodo.com/kb/view/document/How%20to%20connect%20to%20Denodo%20from%20Tableau%20Desktop?category=Northbound+Connections) for detailed steps.
Hope this helps!