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BUG: to_coo raising Systemerror for EA #51007

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Merged
mroeschke merged 1 commit into from
Jan 30, 2023
Merged

BUG: to_coo raising Systemerror for EA #51007

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2 changes: 1 addition & 1 deletion doc/source/whatsnew/v2.0.0.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1154,7 +1154,7 @@ Sparse
^^^^^^
- Bug in :meth:`Series.astype` when converting a ``SparseDtype`` with ``datetime64[ns]`` subtype to ``int64`` dtype raising, inconsistent with the non-sparse behavior (:issue:`49631`,:issue:`50087`)
- Bug in :meth:`Series.astype` when converting a from ``datetime64[ns]`` to ``Sparse[datetime64[ns]]`` incorrectly raising (:issue:`50082`)
-
- Bug in :meth:`Series.sparse.to_coo` raising ``SystemError`` when :class:`MultiIndex` contains a ``ExtensionArray`` (:issue:`50996`)

ExtensionArray
^^^^^^^^^^^^^^
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2 changes: 1 addition & 1 deletion pandas/core/arrays/sparse/scipy_sparse.py
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Expand Up @@ -73,7 +73,7 @@ def _levels_to_axis(

else:
levels_values = lib.fast_zip(
[ss.index.get_level_values(lvl).values for lvl in levels]
[ss.index.get_level_values(lvl).to_numpy() for lvl in levels]
)
codes, ax_labels = factorize(levels_values, sort=sort_labels)
ax_coords = codes[valid_ilocs]
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19 changes: 19 additions & 0 deletions pandas/tests/arrays/sparse/test_accessor.py
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Expand Up @@ -183,6 +183,25 @@ def test_to_coo_nonzero_fill_val_raises(self, fill_value):
with pytest.raises(ValueError, match="fill value must be 0"):
df.sparse.to_coo()

@td.skip_if_no_scipy
def test_to_coo_midx_categorical(self):
# GH#50996
import scipy.sparse

midx = pd.MultiIndex.from_arrays(
[
pd.CategoricalIndex(list("ab"), name="x"),
pd.CategoricalIndex([0, 1], name="y"),
]
)

ser = pd.Series(1, index=midx, dtype="Sparse[int]")
result = ser.sparse.to_coo(row_levels=["x"], column_levels=["y"])[0]
expected = scipy.sparse.coo_matrix(
(np.array([1, 1]), (np.array([0, 1]), np.array([0, 1]))), shape=(2, 2)
)
assert (result != expected).nnz == 0

def test_to_dense(self):
df = pd.DataFrame(
{
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