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When dropping functions, we neeed to remove the function from the list of Functions with that name AND remove the list from the Function map if the list is empty. The second part wasn't happening. Also fixes the test_ddl to properly create all test databases. Change-Id: Id85af7d5db74a31161f48bea3816bdf734063133 Reviewed-on: http://gerrit.ent.cloudera.com:8080/952 Reviewed-by: Nong Li <nong@cloudera.com> Tested-by: jenkins