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/1408#issuecomment-301353831,https://api.github.com/repos/pydata/xarray/issues/1408,301353831,MDEyOklzc3VlQ29tbWVudDMwMTM1MzgzMQ==,6815844,2017-05-15T01:10:25Z,2017-05-15T01:10:25Z,MEMBER,"@benbovy Thanks for the comment.

Actually, I expected the following behavior
```python
In [1]: ds.sel(x=2)
Out[1]: 
<xarray.Dataset>
Dimensions:  (y: 2)
Coordinates:
  * y        (y) object 'a' 'b'
    x        int64 2
Data variables:
    foo      (y) int64 2 5
```
where the selected `x` is automatically converted to a scalar coordinate.

And also for the second issue, I expected something like
```python
In [2]: ds.isel(yx=0)
Out[2]: 
<xarray.Dataset>
Dimensions:  ()
Coordinates:
    y        <U1 'a'
    x        int64 1
Data variables:
    foo      int64 1
```
both `x` and `y` become scalar coordinates.

Back to the first issue, I personally prefer to the automatic renaming
because it enables the following chain methods,
```python
ds.sel(x=2).isel(y=1)
```
that might be intuitive especially for the hierarchic dimension structure.

","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,228295383
https://github.com/pydata/xarray/issues/1408#issuecomment-301303055,https://api.github.com/repos/pydata/xarray/issues/1408,301303055,MDEyOklzc3VlQ29tbWVudDMwMTMwMzA1NQ==,6815844,2017-05-14T10:19:15Z,2017-05-14T10:19:15Z,MEMBER,"@shoyer Thanks for the information.
(Sorry for my inaccurate ipython output)

Another related issue is 

```python
In[3]: ds.isel(yx=1)
Out[3]: 
<xarray.Dataset>
Dimensions:  ()
Coordinates:
    yx       object ('a', 1)
Data variables:
    foo      int64 1
```
where MultiIndex structure is totally gone.
(`ds.isel(yx=[0, 1])` works perfectly.)

I am now looking into the code. Do you guys have any idea to fix them?
I am thinking to modify [Index.remap_label_indexers](https://github.com/pydata/xarray/blob/master/xarray/core/indexing.py#L266)
so that it also returns `selected_dims` containing names of dims that should be converted to scalar coordinates.
","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,228295383