Hello,
You can achieve this using the GETSESSION() function. You can find out more on this function and how to use it on [Denodo Community Page - Other Functions](https://community.denodo.com/docs/html/browse/8.0/en/vdp/vql/functions/other_functions/other_functions#getsession).
An example of how it should be used goes as follows:
```
select getsession('user') from dual();
```
Hope this helps!