itholic commented on code in PR #42793:
URL: https://github.com/apache/spark/pull/42793#discussion_r1319286522
##########
python/pyspark/pandas/tests/frame/test_reshaping.py:
##########
@@ -291,7 +291,8 @@ def test_stack(self):
psdf_multi_level_cols2 = ps.from_pandas(pdf_multi_level_cols2)
self.assert_eq(
- psdf_multi_level_cols2.stack().sort_index(),
pdf_multi_level_cols2.stack().sort_index()
+ psdf_multi_level_cols2.stack().sort_index()[["weight", "height"]],
+ pdf_multi_level_cols2.stack().sort_index()[["weight", "height"]],
Review Comment:
This just for handling the column order:
**DataFrame**
```python
>>> pdf
weight height
kg m
cat 1.0 2.0
dog 3.0 4.0
```
**DataFrame.stack() in Pandas 1.5.3**
```python
>>> pdf.stack()
weight height
cat kg 1.0 NaN
m NaN 2.0
dog kg 3.0 NaN
m NaN 4.0
```
**DataFrame.stack() in Pandas 2.1.0**
```python
>>> pdf.stack()
weight height
cat kg 1.0 NaN
m NaN 2.0
dog kg 3.0 NaN
m NaN 4.0
```
I think maybe this is the minor bug in Pandas, so I reported for the Pandas
community to make sure.
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