How to get the current userid logged in from App Engine SQL?

Hi,

I know we can use the %OperatorID in a AE SQL to get the current userid who logged in but according to Peoplebook %OperatorID is only retained for backward compatibility and going forward should use %UseriD. I guess this works fine in Peoplecode but when comes to Application Engine SQL %userid is not recognized. Could some one from Oracle team review and confirm on what's the best practice to get the current userid logged in a AE SQL..? 

Thanks, Nav