westonpace opened a new issue, #14896:
URL: https://github.com/apache/arrow/issues/14896
### Describe the enhancement requested
The implementation would be almost identical to
pyarrow.TableGroupBy.aggregate except the keys list would be empty. Currently
this does not appear to be possible using an empty array of keys:
```
>>> tab.group_by([]).aggregate([("x", "sum")])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "pyarrow/table.pxi", line 5325, in pyarrow.lib.TableGroupBy.aggregate
File "pyarrow/_compute.pyx", line 2145, in pyarrow._compute._group_by
File "pyarrow/error.pxi", line 144, in
pyarrow.lib.pyarrow_internal_check_status
File "pyarrow/error.pxi", line 100, in pyarrow.lib.check_status
pyarrow.lib.ArrowInvalid: Cannot infer ExecBatch length without at least one
value
```
Even if it were possible, I don't think it would be obvious to obtain the
result in this way.
### Component(s)
Python
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