Virtual Key Figures at runtime

Hi experts,

I have a question about how the BADI works with multiple virtual key figures at run time.

If we have one BADI implementation: one multi provider with two virtual key figures (KF1 and KF2), upon query execution and only KF1 is in the query will it compute both KF1 and KF2?

Can you use a CASE statement to only populate the VKF only if it is being used in the query?

Thanks,

David