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Preserve column ordering in DataFrame.stack #14626

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Dec 16, 2023
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Preserve column ordering in DataFrame.stack #14626

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22 changes: 15 additions & 7 deletions python/cudf/cudf/core/dataframe.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6749,11 +6749,11 @@ def stack(self, level=-1, dropna=True):
cat 1.0 2.0
dog 3.0 4.0
>>> df_multi_level_cols2.stack()
height weight
cat kg <NA> 1.0
m 2.0 <NA>
dog kg <NA> 3.0
m 4.0 <NA>
weight height
cat kg 1.0 <NA>
m <NA> 2.0
dog kg 3.0 <NA>
m <NA> 4.0

**Prescribing the level(s) to be stacked**

Expand Down Expand Up @@ -6925,10 +6925,18 @@ def unnamed_group_generator():
else:
if unnamed_level_values.nlevels == 1:
unnamed_level_values = unnamed_level_values.get_level_values(0)
unnamed_level_values = unnamed_level_values.unique().sort_values()
unnamed_level_values = unnamed_level_values.unique()

data = ColumnAccessor(
dict(zip(unnamed_level_values, stacked)),
dict(
zip(
unnamed_level_values,
[
stacked[i]
for i in unnamed_level_values.argsort().argsort()
],
)
),
isinstance(unnamed_level_values, pd.MultiIndex),
unnamed_level_values.names,
)
Expand Down
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