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/pull/924#issuecomment-236358965,https://api.github.com/repos/pydata/xarray/issues/924,236358965,MDEyOklzc3VlQ29tbWVudDIzNjM1ODk2NQ==,1197350,2016-07-30T10:54:50Z,2016-07-30T10:54:50Z,MEMBER,"This looks like a really useful addition. It would be useful for me to have an example of how this is supposed to work. The tests are a starting point, but perhaps kind of trivial cases.

If I create the following 2D dataset:

``` python
ds = xr.Dataset({'foo': (['x','y'], np.random.rand(2,4))})
```

and then do

``` python
ds.groupby(['x','y']).sum()
```

What should the coordinates of the output be? Every unique combination of `x` and `y`?
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