auto-filter depending on user

[PaulPoulain]

Use case
I want to create a dashboard/report where a user can see result depending on some value that are specific to him.
For example: Joe is responsible for acquisition on budget J, I want a dashboard to display budget J related informations. Joe doesn't have to select anything, and he can't see the same dashboard related to budget K, that is for Karl.

idea
In the users definition, the administrator can set user-variables. For example:
"budget=J"
In the report creation, there's a new operator "equal variable" where the report creator can select a variable (budget in my example)
At runtime, the user value is automatically selected.