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/2786#issuecomment-540184423,https://api.github.com/repos/pydata/xarray/issues/2786,540184423,MDEyOklzc3VlQ29tbWVudDU0MDE4NDQyMw==,2448579,2019-10-09T20:40:35Z,2019-10-09T20:40:35Z,MEMBER,"This is broken because you're expanding along the grouped dimension `A`.

Changing it to `expand_dims(['C'])` works
```
<xarray.DataArray (A: 2, B: 2, C: 1)>
array([[[1],
        [2]],

       [[3],
        [4]]])
Dimensions without coordinates: A, B, C
```

If you want to preserve the dimension `A` with length 1 in each group use 
```
r2 = xa.groupby('A', squeeze=False)
```

I don't know that we should do anything here?","{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,414277715