def do_sort(block_list, clear_input_blocks: bool, *_):
# Handle empty dataset.
if block_list.initial_num_blocks() == 0:
return block_list, {}
if clear_input_blocks:
blocks = block_list.copy()
block_list.clear()
else:
blocks = block_list
if isinstance(key, list):
if not key:
raise ValueError("`key` must be a list of non-zero length")
for subkey in key:
_validate_key_fn(ds, subkey)
else:
_validate_key_fn(ds, key)
return sort_impl(blocks, clear_input_blocks, key, descending)
def _validate(self, ds: "Dataset") -> None:
_validate_key_fn(ds, self._key_fn)