the source is available you know... it is Open Source. You can SEE what happens in this method. You can create a small testcase to achieve the same.
I knew I'd get that response ;)
I was hoping someone knew off hand
Sorry I disappointed you. There are few people who know these things by heart. Those guys (when does a girl get on the team :-(, then I switch jobs to) are busy developing and spend less time on the forums than I do.
I myself have to open my IDE, dig into the code, analyze it AND describe it. That probably takes me 30 minutes. Roughly the same as it would have taken you (assuming you are a better developer than I am (not to difficult ;-)) with just a little less knowledge of jBPM.
btw, if you encounter probelems, we're more than happy to help :-)
I am pretty sure (but not 100%) that it drops/recreates the way it is right now, because the JUnit tests rely on it to create a fresh schema each time.
But like Ronald said, looking at the code will answer everything :) That, or just even running it to see if it kills your database (try it on a test DB first)