Function test_nunique_approx

dask/dataframe/dask_expr/tests/test_reductions.py:211–214

(split_every, pdf, df)

@pytest.mark.parametrize("split_every", [None, False, 2, 10])
def test_nunique_approx(split_every, pdf, df):
    approx = df.nunique_approx(split_every=split_every).compute()
    exact = len(df.drop_duplicates())
    assert abs(approx - exact) <= 2 or abs(approx - exact) / exact < 0.05


def test_unique_base(df, pdf):