html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/2024#issuecomment-423919063,https://api.github.com/repos/pydata/xarray/issues/2024,423919063,MDEyOklzc3VlQ29tbWVudDQyMzkxOTA2Mw==,2448579,2018-09-24T09:27:18Z,2018-09-24T09:27:18Z,MEMBER,"There's a bigger issue:

```
shape = (3, 5, 2, 2)
d = xr.DataArray(np.linspace(0, 1, num=np.prod(shape)).reshape(shape), 
                 dims=['y', 'x', 'columns', 'rows'],
                 coords={'y': np.arange(shape[0]),
                         'x': np.arange(shape[1]),
                         'columns': np.arange(shape[2]),
                         'rows': np.arange(shape[3])})
d.y.attrs['units'] = 'yunits'
d.x.attrs['units'] = 'xunits'
d.columns.attrs['units'] = 'cunits'
d.rows.attrs['units'] = 'runits'
```

`g = d.plot(x='x', y='y', col='columns', row='rows')`
![image](https://user-images.githubusercontent.com/2448579/45944886-b8695080-c026-11e8-85fb-35ebd28314f5.png)

`g.map(lambda col, row: plt.plot(col, row, 'wo'), 'columns', 'rows')`
Note that the colorbar and axes-labels are now screwed up.
![image](https://user-images.githubusercontent.com/2448579/45944887-bb644100-c026-11e8-8a22-9b6c30220834.png)

After #2435, the result is good.
![image](https://user-images.githubusercontent.com/2448579/45944896-bdc69b00-c026-11e8-8b5d-ce33198ee9cf.png)
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