docs: def _batches_to_tmpfile(in_record_sep, in_column_sep, in_batches, batch_to_file_s):
          """Create files to store in-batches contents (if necessary)"""
          for i, b2f in enumerate(batch_to_file_s):
              if b2f.is_tmpfile():
                  input_str = BaseShellOperator._input_str(in_batches[i], in_record_sep, in_column_sep)
                  b2f.write_tmpfile(input_str)