issues: 1174386963

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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
1174386963 I_kwDOAMm_X85F_7kT 6382 `reindex` drops attrs 14808389 closed 0     1 2022-03-19T22:37:46Z 2022-03-21T07:53:05Z 2022-03-21T07:53:04Z MEMBER      

What happened?

reindex stopped propagating attrs (detected in xarray-contrib/pint-xarray#159).

As far as I can tell, the new reindexing code in Aligner does not handle attrs yet?

Minimal Complete Verifiable Example

```Python

before #5692

In [1]: import xarray as xr ...: ...: xr.set_options(keep_attrs=True) ...: ...: ds = xr.tutorial.open_dataset("air_temperature")

In [2]: ds.reindex(lat=range(10, 80, 5)).lat Out[2]: <xarray.DataArray 'lat' (lat: 14)> array([10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75]) Coordinates: * lat (lat) int64 10 15 20 25 30 35 40 45 50 55 60 65 70 75 Attributes: standard_name: latitude long_name: Latitude units: degrees_north axis: Y

In [3]: ds.reindex(lat=xr.DataArray(range(10, 80, 5), attrs={"attr": "value"}, dims="lat")).lat Out[3]: <xarray.DataArray 'lat' (lat: 14)> array([10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75]) Coordinates: * lat (lat) int64 10 15 20 25 30 35 40 45 50 55 60 65 70 75 Attributes: standard_name: latitude long_name: Latitude units: degrees_north axis: Y

after #5692

In [3]: import xarray as xr ...: ...: xr.set_options(keep_attrs=True) ...: ...: ds = xr.tutorial.open_dataset("air_temperature")

In [4]: ds.reindex(lat=range(10, 80, 5)).lat Out[4]: <xarray.DataArray 'lat' (lat: 14)> array([10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75]) Coordinates: * lat (lat) int64 10 15 20 25 30 35 40 45 50 55 60 65 70 75

In [5]: ds.reindex(lat=xr.DataArray(range(10, 80, 5), attrs={"attr": "value"}, dims="lat")).lat Out[5]: <xarray.DataArray 'lat' (lat: 14)> array([10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75]) Coordinates: * lat (lat) int64 10 15 20 25 30 35 40 45 50 55 60 65 70 75 ```

 
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   completed 13221727 issue

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