issues: 446868198

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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
446868198 MDU6SXNzdWU0NDY4NjgxOTg= 2978 sel(method=x) is not propagated for MultiIndex 5308236 open 0     3 2019-05-21T23:30:56Z 2022-04-09T02:09:00Z   NONE      

When passing a method different from None to the selection method (e.g. .sel(method='nearest')), it is not propagated if the index is a MultiIndex. Specifically, the passing of the method key seems to be missing in xarray/core/indexing.py:convert_label_indexer https://github.com/pydata/xarray/blob/0811141e8f985a1f3b95ead92c3850cc74e160a5/xarray/core/indexing.py#L158-L159

For a normal index, the method is passed properly: https://github.com/pydata/xarray/blob/0811141e8f985a1f3b95ead92c3850cc74e160a5/xarray/core/indexing.py#L181

This leads to an unexpected KeyError when the selection value is not in the index, even if a nearest value could have been found.

Output of xr.show_versions()

INSTALLED VERSIONS ------------------ commit: None python: 3.6.7.final.0 python-bits: 64 OS: Linux OS-release: 4.4.0-143-generic machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: en_US.UTF-8 LOCALE: en_US.UTF-8 xarray: 0.10.8 pandas: 0.24.2 numpy: 1.16.2 scipy: 1.1.0 netCDF4: 1.4.2 h5netcdf: None h5py: 2.8.0 Nio: None zarr: None bottleneck: None cyordereddict: None dask: 0.20.0 distributed: None matplotlib: 3.0.1 cartopy: None seaborn: 0.9.0 setuptools: 40.8.0 pip: 19.0.3 conda: None pytest: 3.10.0 IPython: 7.1.1 sphinx: None 
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     13221727 issue

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