Github user rxin commented on the issue:
https://github.com/apache/spark/pull/15135
Pandas doesn't support this, does it?
```
>>> pd.read_csv('test.csv').groupby('a').agg('sum', 'avg')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Library/Python/2.7/site-packages/pandas/core/groupby.py", line
3597, in aggregate
return super(DataFrameGroupBy, self).aggregate(arg, *args, **kwargs)
File "/Library/Python/2.7/site-packages/pandas/core/groupby.py", line
3114, in aggregate
result, how = self._aggregate(arg, _level=_level, *args, **kwargs)
File "/Library/Python/2.7/site-packages/pandas/core/base.py", line 428,
in _aggregate
return getattr(self, arg)(*args, **kwargs), None
TypeError: f() takes exactly 1 argument (2 given)
>>> pd.read_csv('test.csv').groupby('a').agg(['sum', 'avg'])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Library/Python/2.7/site-packages/pandas/core/groupby.py", line
3597, in aggregate
return super(DataFrameGroupBy, self).aggregate(arg, *args, **kwargs)
File "/Library/Python/2.7/site-packages/pandas/core/groupby.py", line
3114, in aggregate
result, how = self._aggregate(arg, _level=_level, *args, **kwargs)
File "/Library/Python/2.7/site-packages/pandas/core/base.py", line 564,
in _aggregate
return self._aggregate_multiple_funcs(arg, _level=_level), None
File "/Library/Python/2.7/site-packages/pandas/core/base.py", line 609,
in _aggregate_multiple_funcs
results.append(colg.aggregate(arg))
File "/Library/Python/2.7/site-packages/pandas/core/groupby.py", line
2574, in aggregate
(_level or 0) + 1)
File "/Library/Python/2.7/site-packages/pandas/core/groupby.py", line
2636, in _aggregate_multiple_funcs
results[name] = obj.aggregate(func)
File "/Library/Python/2.7/site-packages/pandas/core/groupby.py", line
2570, in aggregate
return getattr(self, func_or_funcs)(*args, **kwargs)
File "/Library/Python/2.7/site-packages/pandas/core/groupby.py", line
498, in __getattr__
(type(self).__name__, attr))
AttributeError: 'SeriesGroupBy' object has no attribute 'avg'
```
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