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feat: add dask Expr.max and test #691

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Jul 31, 2024
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feat: add dask Expr.max and test #691

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6 changes: 6 additions & 0 deletions narwhals/_dask/expr.py
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Original file line number Diff line number Diff line change
Expand Up @@ -201,6 +201,12 @@ def min(self) -> Self:
"min",
)

def max(self) -> Self:
return self._from_call(
lambda _input: _input.max(),
"max",
)

def shift(self, n: int) -> Self:
return self._from_call(
lambda _input, n: _input.shift(n),
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10 changes: 10 additions & 0 deletions tests/dask_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -86,6 +86,16 @@ def test_min() -> None:
compare_dicts(result, expected)


def test_max() -> None:
import dask.dataframe as dd

dfdd = dd.from_pandas(pd.DataFrame({"a": [1, 2, 3], "b": [4, 5, 6]}))
df = nw.from_native(dfdd)
result = df.with_columns((nw.col("a") + nw.col("b").max()).alias("c"))
expected = {"a": [1, 2, 3], "b": [4, 5, 6], "c": [7, 8, 9]}
compare_dicts(result, expected)


def test_cum_sum() -> None:
import dask.dataframe as dd

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