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pandas dtype Int64 not recognised as numeric in plot.box()

See original GitHub issue

Description

plot.box() fails with No numeric types to aggregate when using the pandas dtype Int64 in a dataframe. However, the standard dtype int64 works.

Example code

data = np.random.randint(1, 9, (10, 5))
df = pd.DataFrame(data, columns=['A', 'B', 'C', 'D', 'E'], dtype='Int64')
df.plot.box()

Traceback and Output

Cell output

DataError [Call holoviews.ipython.show_traceback() for details]
No numeric types to aggregate

Subsequent Traceback

Traceback (most recent call last):

  File "C:\Users\mydev\Miniconda3\envs\jlab3\lib\site-packages\holoviews\plotting\bokeh\element.py", line 1583, in _init_glyphs
    group_style = self._apply_transforms(element, ds_data, ranges, group_style, style_group)

  File "C:\Users\mydev\Miniconda3\envs\jlab3\lib\site-packages\holoviews\plotting\bokeh\stats.py", line 113, in _apply_transforms
    element = element.aggregate(function=np.mean)

  File "C:\Users\mydev\Miniconda3\envs\jlab3\lib\site-packages\holoviews\core\data\__init__.py", line 201, in pipelined_fn
    result = method_fn(*args, **kwargs)

  File "C:\Users\mydev\Miniconda3\envs\jlab3\lib\site-packages\holoviews\core\data\__init__.py", line 917, in aggregate
    aggregated, dropped = self.interface.aggregate(self, kdims, function, **kwargs)

  File "C:\Users\mydev\Miniconda3\envs\jlab3\lib\site-packages\holoviews\core\data\pandas.py", line 244, in aggregate
    df = grouped.aggregate(fn, **kwargs).reset_index()

  File "C:\Users\mydev\Miniconda3\envs\jlab3\lib\site-packages\pandas\core\groupby\generic.py", line 945, in aggregate
    result, how = aggregate(self, func, *args, **kwargs)

  File "C:\Users\mydev\Miniconda3\envs\jlab3\lib\site-packages\pandas\core\aggregation.py", line 577, in aggregate
    return getattr(obj, f)(), None

  File "C:\Users\mydev\Miniconda3\envs\jlab3\lib\site-packages\pandas\core\groupby\groupby.py", line 1496, in mean
    return self._cython_agg_general(

  File "C:\Users\mydev\Miniconda3\envs\jlab3\lib\site-packages\pandas\core\groupby\generic.py", line 1015, in _cython_agg_general
    agg_mgr = self._cython_agg_blocks(

  File "C:\Users\mydev\Miniconda3\envs\jlab3\lib\site-packages\pandas\core\groupby\generic.py", line 1114, in _cython_agg_blocks
    raise DataError("No numeric types to aggregate")

pandas.core.base.DataError: No numeric types to aggregate

Version info

conda env

Windows 10
- hvplot            0.7.0   
- python           3.8.6   
- pandas           1.2.1   
- numpy            1.19.5  
- bokeh             2.2.3   
- holoviews       1.14.1
- pyviz_comms  2.0.1