code: private void dropColumnFamily(TableInfo tableInfo) throws Exception
      {
          if (isCql3Enabled(tableInfo))
          {
              dropTableUsingCql(tableInfo);
          }
          else
          {
              cassandra_client.system_drop_column_family(tableInfo.getTableName());
          }
      }
docs: Drops column family specified in table info.
  
  @param tableInfo
  the table info
  @throws Exception
  the exception