html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/6230#issuecomment-1032051447,https://api.github.com/repos/pydata/xarray/issues/6230,1032051447,IC_kwDOAMm_X849g9r3,1217238,2022-02-07T23:40:48Z,2022-02-07T23:40:48Z,MEMBER,"In the long term (cc @benbovy) I think we would ideally split `IndexVariable` into two classes:

1. `FrozenVariable` which is just an immutable `Variable`, and thus that can be safely used for coordinates that have indexes.
2. `PandasIndexArray` which wraps `pandas.Index` objects to satisfy the `np.ndarray` interface. This is the object which could allow `duck_array_ops.isin` to use the `pandas.Index.isin` method.","{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,1120583442
https://github.com/pydata/xarray/issues/6230#issuecomment-1032008540,https://api.github.com/repos/pydata/xarray/issues/6230,1032008540,IC_kwDOAMm_X849gzNc,2448579,2022-02-07T22:40:18Z,2022-02-07T22:40:18Z,MEMBER,"Are we still removing `IndexVariable`? If not, we could define `isin` on `Variable` and `IndexVariable` and it would be quite clean.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,1120583442
https://github.com/pydata/xarray/issues/6230#issuecomment-1031811347,https://api.github.com/repos/pydata/xarray/issues/6230,1031811347,IC_kwDOAMm_X849gDET,1217238,2022-02-07T19:01:54Z,2022-02-07T19:01:54Z,MEMBER,"Oh, I guess the challenge is that `apply_ufunc` operates on arrays, not indexes. I'm not entirely sure how to deal with this easily....","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,1120583442
https://github.com/pydata/xarray/issues/6230#issuecomment-1031810590,https://api.github.com/repos/pydata/xarray/issues/6230,1031810590,IC_kwDOAMm_X849gC4e,1217238,2022-02-07T19:01:08Z,2022-02-07T19:01:08Z,MEMBER,"Yes, I think replacing this with something like `lambda x, y: x.isin(y) if isinstance(x, pd.Index) else np.isin(x, y)` could work","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,1120583442
https://github.com/pydata/xarray/issues/6230#issuecomment-1031766376,https://api.github.com/repos/pydata/xarray/issues/6230,1031766376,IC_kwDOAMm_X849f4Fo,2448579,2022-02-07T18:11:26Z,2022-02-07T18:11:26Z,MEMBER,"Do all `pd.Index` objects define `.isin`?

If so we could special case Index objects here (note `duck_array_ops.isin` is `numpy.isin`):

https://github.com/pydata/xarray/blob/d47cf0c850cb70429373782b3c1e0329d14fd05a/xarray/core/common.py#L1423-L1428

cc @shoyer","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,1120583442