Hive test fail after first run

I don't know why but on my Mac, not on Linux, or on other peoples Mac's. leaving the derby metastor db on the file system results in the tests failing the second time with an array index out of bounds error as captured by derby.log.

I can work around this by cleaning out the DB state before running the tests. I really don't know why, but it is 100% reproducible, but just for me . So updating the build to clean it up before the tests run.