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  • Attributes of Dataset coordinates are dropped/replaced when adding a DataArray · 2 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
406959556 https://github.com/pydata/xarray/issues/2245#issuecomment-406959556 https://api.github.com/repos/pydata/xarray/issues/2245 MDEyOklzc3VlQ29tbWVudDQwNjk1OTU1Ng== dcherian 2448579 2018-07-23T07:01:07Z 2018-07-23T07:01:28Z MEMBER

This is because priority_arg=1 in https://github.com/pydata/xarray/blob/b8a342ae845a7d734d391c4b597ee689ed9c6a72/xarray/core/merge.py#L579

So the old co-ordinate (with attrs) is replaced by the new co-ordinate (without attrs).

Example: ds['b'] = xr.DataArray(np.arange(10), dims='y') in the above creates a new dimension y with no attrs that is given priority when merging. This seems like intended behaviour because changing priority_arg to 0 makes a lot of tests fail.

 
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   Attributes of Dataset coordinates are dropped/replaced when adding a DataArray 334833619
403934444 https://github.com/pydata/xarray/issues/2245#issuecomment-403934444 https://api.github.com/repos/pydata/xarray/issues/2245 MDEyOklzc3VlQ29tbWVudDQwMzkzNDQ0NA== shoyer 1217238 2018-07-10T19:11:12Z 2018-07-10T19:11:12Z MEMBER

This looks like the same issue as https://github.com/pydata/xarray/issues/2276.

I agree that this is probably a bug. This might be related to a recent internal refactor of Dataset.__setitem__ in https://github.com/pydata/xarray/pull/2162 (see the changes in xarray/core/merge.py)

 
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   Attributes of Dataset coordinates are dropped/replaced when adding a DataArray 334833619

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