code: def does_table_exist(self, connection):
          
  
          if '.' in self.table:
              query = ("select 1 as table_exists "
                       "from information_schema.tables "
                       "where table_schema = lower(%s) and table_name = lower(%s) limit 1")
          else:
              query = ("select 1 as table_exists "
                       "from pg_table_def "
                       "where tablename = lower(%s) limit 1")
          cursor = connection.cursor()
          try:
              cursor.execute(query, tuple(self.table.split('.')))
              result = cursor.fetchone()
              return bool(result)
          finally:
              cursor.close()
docs: Determine whether the table already exists.