issues: 2215059449

This data as json

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
2215059449 PR_kwDOAMm_X85rJr7c 8888 to_base_variable: coerce multiindex data to numpy array 4160723 open 0     3 2024-03-29T10:10:42Z 2024-03-29T15:54:19Z   MEMBER   0 pydata/xarray/pulls/8888
  • [x] Closes #8887, and probably supersedes #8809
  • [x] Tests added
  • [ ] User visible changes (including notable bug fixes) are documented in whats-new.rst
  • ~~New functions/methods are listed in api.rst~~

@slevang this should also make work your test case added in #8809. I haven't added it here, instead I added a basic check that should be enough.

I don't really understand why the serialization backends (zarr?) do not seem to work with the PandasMultiIndexingAdapter.__array__() implementation, which should normally coerce the multi-index levels into numpy arrays as needed. Anyway, I guess that coercing it early like in this PR doesn't hurt and may avoid the confusion of a non-indexed, isolated coordinate variable that still wraps a pandas.MultiIndex. 

{
    "url": "https://api.github.com/repos/pydata/xarray/issues/8888/reactions",
    "total_count": 0,
    "+1": 0,
    "-1": 0,
    "laugh": 0,
    "hooray": 0,
    "confused": 0,
    "heart": 0,
    "rocket": 0,
    "eyes": 0
}
     13221727 pull

Links from other tables