issue_comments: 258567735

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https://github.com/pydata/xarray/issues/1072#issuecomment-258567735 https://api.github.com/repos/pydata/xarray/issues/1072 258567735 MDEyOklzc3VlQ29tbWVudDI1ODU2NzczNQ== 5572303 2016-11-04T22:58:24Z 2016-11-04T22:58:24Z CONTRIBUTOR

Another test:

```

left <xarray.DataArray (x: 2, y: 2)> array([[1, 1], [1, 1]]) Coordinates: * x (x) |S1 'a' 'b' * y (y) int64 -2 0 right <xarray.DataArray (x: 2, y: 2)> array([[0, 0], [0, 0]]) Coordinates: * x (x) |S1 'b' 'c' * y (y) int64 0 2 combine_first(left, right) <xarray.DataArray (x: 3, y: 3)> array([[ 1., 1., nan], [ 1., 1., 0.], [ nan, 0., 0.]]) Coordinates: * x (x) object 'a' 'b' 'c' * y (y) int64 -2 0 2 combine_first(right, left) <xarray.DataArray (x: 3, y: 3)> array([[ 1., 1., nan], [ 1., 0., 0.], [ nan, 0., 0.]]) Coordinates: * x (x) object 'a' 'b' 'c' * y (y) int64 -2 0 2 ```

 
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