ueshin opened a new pull request, #54276:
URL: https://github.com/apache/spark/pull/54276
### What changes were proposed in this pull request?
Make `groupby(as_index=False)` include a grouping that is not in the
DataFrame with pandas 3.
### Why are the changes needed?
The behavior of `groupby(..., as_index=False)` has changed in pandas 3.
It includes a grouping that is not in the DataFrame.
For example:
```py
>>> pdf1 = pd.DataFrame({"c": [4, 2, 7, 3, None, 1, 1, 1, 2, 2], "d":
list("abcdefghti")})
>>> pdf2 = pd.DataFrame({"a": [1, 2, 6, 4, 4, 6, 4, 3, 7], "b": [4, 2, 7, 3,
3, 1, 1, 1, 2]})
```
- pandas 2
```py
>>> pdf1.groupby(pdf2.a, as_index=False)["c"].sum()
c
0 4.0
1 2.0
2 1.0
3 4.0
4 8.0
5 2.0
```
- pandas 3
```py
>>> pdf1.groupby(pdf2.a, as_index=False)["c"].sum()
a c
0 1.0 4.0
1 2.0 2.0
2 3.0 1.0
3 4.0 4.0
4 6.0 8.0
5 7.0 2.0
```
### Does this PR introduce _any_ user-facing change?
Yes, it will behave more like pandas 3.
### How was this patch tested?
The existing tests should pass.
### Was this patch authored or co-authored using generative AI tooling?
No.
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