private void dropTables() throws Exception {
    runStatementOnDriver("drop table if exists T");
    for (Table t : Table.values()) {
      runStatementOnDriver("drop table if exists " + t);
    }
  }
this is to test differety types of Acid tables
itests/hive-unit/src/test/java/org/apache/hadoop/hive/ql/TestAcidOnTez.java