issues: 193294569

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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
193294569 MDU6SXNzdWUxOTMyOTQ1Njk= 1151 Scalar coords vs. concat 6213168 open 0     11 2016-12-03T15:42:18Z 2021-07-08T17:42:18Z   MEMBER      

Why does this work: ```

import xarray a = xarray.DataArray([1, 2, 3], dims=['x'], coords={'y': 10}) b = xarray.DataArray([4, 5, 6], dims=['x']) a + b <xarray.DataArray (x: 3)> array([5, 7, 9]) Coordinates: y int64 10 But this doesn't? xarray.concat([a, b], dim='x') KeyError: 'y' ``` It doesn't seem coherent to me...

 
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     13221727 issue

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