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feat: create pyarrow struct out of expressions #2275

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feat: create pyarrow struct out of expressions #2275

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20 changes: 20 additions & 0 deletions tests/struct_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -280,3 +280,23 @@ def test_struct_flatten_recursive(df):

df_flat = df.struct.flatten(recursive=False)
assert df_flat.get_column_names() == ['array_copy1', 'array_copy2', 'integer']


def test_struct_create():
data = {
'index': [1, 2, 3, 4, 5],
'value': [10, 20, 30, 40, 50],
'place': ['Amsterdam', 'London', 'Paris', 'Ohrid', 'Edinburgh'],
}

df = vaex.from_dict(data)

df['content'] = df.struct.create(['index', 'value', df.place])

assert df.shape == (5, 4)
assert df['content'].dtype == 'struct' # perhaps we should have a better way to check this

df['content_new_names'] = df.struct.create({'index': 'Index', 'value': 'Value', df.place: 'Location'})

assert df.shape == (5, 5)
assert df['content_new_names'].dtype == 'struct'