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Add slice_rows to interchange protocol #349

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Add slice_rows to interchange protocol #349

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94167b1
add slice_rows to interchange protocol
MarcoGorelli Feb 13, 2024
1674828
use offset and length
MarcoGorelli Feb 13, 2024
5b09b58
offset => size
MarcoGorelli Feb 13, 2024
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24 changes: 24 additions & 0 deletions protocol/dataframe_protocol.py
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
from __future__ import annotations

from abc import (
ABC,
abstractmethod,
Expand Down Expand Up @@ -476,6 +478,28 @@ def select_columns_by_name(self, names: Sequence[str]) -> "DataFrame":
"""
pass

@abstractmethod
def slice_rows(
self,
offset: int,
size: int | None,
) -> DataFrame:
"""
Select a subset of rows corresponding to a slice.

Parameters
----------
offset : int
Row offset to start slice at.
size : int or None
Number of rows of the resulting slice. If None, slice to end of DataFrame.

Returns
-------
DataFrame
"""
pass

@abstractmethod
def get_chunks(self, n_chunks: Optional[int] = None) -> Iterable["DataFrame"]:
"""
Expand Down