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/4197#issuecomment-653578137,https://api.github.com/repos/pydata/xarray/issues/4197,653578137,MDEyOklzc3VlQ29tbWVudDY1MzU3ODEzNw==,14808389,2020-07-03T14:38:57Z,2020-07-03T14:41:16Z,MEMBER,"you should be able to emulate that using:
```python
In [2]: data = np.array([ 
   ...:     [np.nan, np.nan, np.nan, np.nan], 
   ...:     [np.nan, 0, 2, np.nan], 
   ...:     [np.nan, 2, 0, np.nan], 
   ...:     [np.nan, np.nan, np.nan, np.nan], 
   ...: ]) 
   ...: da = xr.DataArray(data, dims=(""x"", ""y""))

In [3]: def shrink(arr): 
   ...:     notnull = da.notnull() 
   ...:     indexers = { 
   ...:         dim: notnull.any(dim=set(da.dims) - set([dim])) 
   ...:         for dim in da.dims 
   ...:     } 
   ...:     return arr.sel(**indexers) 
   ...:

In [4]: da
Out[4]: 
<xarray.DataArray (x: 4, y: 4)>
array([[nan, nan, nan, nan],
       [nan,  0.,  2., nan],
       [nan,  2.,  0., nan],
       [nan, nan, nan, nan]])
Dimensions without coordinates: x, y

In [5]: shrink(da)
Out[5]: 
<xarray.DataArray (x: 2, y: 2)>
array([[0., 2.],
       [2., 0.]])
Dimensions without coordinates: x, y
```
@pydata/xarray: is this common enough to add it to the API?

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