issues: 228295383

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
228295383 MDU6SXNzdWUyMjgyOTUzODM= 1408 .sel does not keep selected coordinate value in case with MultiIndex 6815844 closed 0     8 2017-05-12T13:40:34Z 2022-03-17T17:11:41Z 2022-03-17T17:11:41Z MEMBER      

.sel method usually keeps selected coordinate value as a scalar coordinate

```python In[4] ds1 = xr.Dataset({'foo': (('x',), [1, 2, 3])}, {'x': [1, 2, 3], 'y': 'a'})

Out[4]: <xarray.Dataset> Dimensions: () Coordinates: y <U1 'a' x int64 1 Data variables: foo int64 1 ```

But in MultiIndex case, does not.

python In[5] ds2 = xr.Dataset({'foo': (('x',), [4, 5, 6])}, {'x': [1, 2, 3], 'y': 'b'}) ds = xr.concat([ds1, ds2], dim='y').stack(yx=['y', 'x']) ds.sel(x=2) Out[5] <xarray.Dataset> Dimensions: (y: 2) Coordinates: * y (y) object 'a' 'b' Data variables: foo (y) int64 2 5 x is gone. Is it a desired behavior?

 
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   completed 13221727 issue

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