fix type hint for sort_by (apache#130)

sort_by takes str or list[tuple(name, order)] as its argument where str is a field name not a sort order

Author: mariusvniekerk

pyarrow-stubs/__lib_pxi/table.pyi

@@ -434,7 +434,7 @@ class _Tabular(_PandasConvertible[pd.DataFrame], Generic[_ColumnT]):
     def schema(self) -> Schema: ...
     @property
     def nbytes(self) -> int: ...
-    def sort_by(self, sorting: Order | list[tuple[str, Order]], **kwargs) -> Self: ...
+    def sort_by(self, sorting: str | list[tuple[str, Order]], **kwargs) -> Self: ...
     def take(self, indices: Indices) -> Self: ...
     def filter(
         self, mask: Mask | Expression, null_selection_behavior: NullSelectionBehavior = "drop"

pyarrow-stubs/_dataset.pyi

@@ -101,7 +101,7 @@ class Dataset(lib._Weakrefable):
     @property
     def schema(self) -> lib.Schema: ...
     def filter(self, expression: Expression) -> Self: ...
-    def sort_by(self, sorting: Order | list[tuple[str, Order]], **kwargs) -> InMemoryDataset: ...
+    def sort_by(self, sorting: str | list[tuple[str, Order]], **kwargs) -> InMemoryDataset: ...
     def join(
         self,
         right_dataset: Dataset,