itholic opened a new pull request, #42798:
URL: https://github.com/apache/spark/pull/42798
### What changes were proposed in this pull request?
This PR proposes to support string type columns for `DataFrameGroupBy.sum`.
### Why are the changes needed?
To match the behavior with latest pandas.
### Does this PR introduce _any_ user-facing change?
Yes, from now on the `DataFrameGroupBy.sum` follows the behavior of latest
pandas as below:
**Test DataFrame**
```python
>>> psdf
A B C D
0 1 3.1 a True
1 2 4.1 b False
2 1 4.1 b False
3 2 3.1 a True
```
**Before**
```python
>>> psdf.groupby("A").sum().sort_index()
B D
A
1 7.2 1
2 7.2 1
```
**After**
```python
>>> psdf.groupby("A").sum().sort_index()
B C D
A
1 7.2 ab 1
2 7.2 ba 1
```
### How was this patch tested?
Updated the existing UTs to support string type columns.
### Was this patch authored or co-authored using generative AI tooling?
No.
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