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/1527#issuecomment-700603268,https://api.github.com/repos/pydata/xarray/issues/1527,700603268,MDEyOklzc3VlQ29tbWVudDcwMDYwMzI2OA==,10194086,2020-09-29T10:05:42Z,2020-09-29T10:05:42Z,MEMBER,"However, `other_sel` in `_yield_binary_applied` looks like:

```python
<xarray.DataArray (x: 10)>
array([0., 0., 0., 0., 0., 0., 0., 0., 0., 0.])
Coordinates:
  * x          (x) int64 0 1 2 3 4 5 6 7 8 9
    dayofyear  int64 1
```

https://github.com/pydata/xarray/blob/f821fe20595c3700375ccecebf88e01a61444777/xarray/core/groupby.py#L484","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,253107677
https://github.com/pydata/xarray/issues/1527#issuecomment-700600387,https://api.github.com/repos/pydata/xarray/issues/1527,700600387,MDEyOklzc3VlQ29tbWVudDcwMDYwMDM4Nw==,10194086,2020-09-29T10:00:14Z,2020-09-29T10:00:14Z,MEMBER,"This is still relevant. Now raises

```python
ValueError: 'x' not present in all datasets and coords='different'.
Either add 'x' to datasets where it is missing or specify coords='minimal'.
```
I think the issue may be that `_dummy_copy` does not include the x-dimension:
```python
xr.core.groupby._dummy_copy(d2.groupby('time.dayofyear').mean('time'))
```
yields
```python
<xarray.DataArray ()>
array(nan)
```

","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,253107677