westonpace opened a new issue, #14898:
URL: https://github.com/apache/arrow/issues/14898
### Describe the enhancement requested
This method would return a table with one column for each key and one row
for each unique combination of keys. This can actually be done today by
passing in an empty list of aggregates, and the result should be identical,
however this is not obvious behavior to the user:
```
>>> tab = pa.Table.from_pydict({"x": [1, 2, 3, 1, 2, 3], "y": ["a", "b",
"c", "c", "b", "a"]})
>>> tab.group_by(["x", "y"]).aggregate([])
pyarrow.Table
x: int64
y: string
----
x: [[1,2,3,1,3]]
y: [["a","b","c","c","a"]]
```
### Component(s)
Python
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