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Fix: evaluate iterator when selection=True #2308

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Fix: evaluate iterator when selection=True #2308

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20 changes: 20 additions & 0 deletions tests/evaluate_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,26 @@ def test_evaluate_iterator(df_local, chunk_size, prefetch, parallel):
assert total == z.sum()


def test_evaluate_iterator_selection(df_local):
df = df_local
bool_expr = df.x > 9
with small_buffer(df):
df.select(bool_expr)
x = df[bool_expr].x.to_numpy()
z = df[bool_expr].z.to_numpy()
total = 0
for i1, i2, chunk in df.evaluate_iterator('x', selection=True, chunk_size=3, array_type='numpy-arrow'):
assert x[i1:i2].tolist() == chunk.tolist()
total += chunk.sum()
assert total == x.sum()

total = 0
for i1, i2, chunk in df.evaluate_iterator('z', selection=True, chunk_size=3, array_type='numpy-arrow'):
assert z[i1:i2].tolist() == chunk.tolist()
total += chunk.sum()
assert total == z.sum()


@pytest.mark.parametrize("chunk_size", [2, 5])
@pytest.mark.parametrize("parallel", [True, False])
@pytest.mark.parametrize("array_type", ['numpy', 'list', 'xarray'])
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