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feature improvement: enable list aggregation on struct columns #2274

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feature improvement: enable list aggregation on struct columns #2274

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18 changes: 18 additions & 0 deletions tests/agg_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -747,3 +747,21 @@ def test_agg_nunique_selections(df_factory):
assert dfg.result_int.tolist()[0] == df.x_int.nunique(selection='cond==True')
assert dfg.result_str.tolist()[0] == df.x_str.nunique(selection='cond==True')
assert dfg.result_float.tolist()[0] == df.x_float.nunique(selection='cond==True')


@pytest.mark.parametrize('assume_sparse', [True, False])
def test_agg_list_on_struct(assume_sparse):
struct = pa.StructArray.from_arrays(
arrays=[['Amsterdam', 'London', 'Paris', 'Ohrid', 'Edinburgh'],
['Netherlands', 'United Kingdom', 'France', 'Macedonia', 'Scotland']],
names=['city', 'country'],
)

data = {
'x': [1, 1, 2, 2, 1],
'y': struct,
}

df = vaex.from_dict(data)
df_grouped = df.groupby('x', assume_sparse=assume_sparse).agg({'y': 'list'})
assert df_grouped.shape == (2, 2)