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https://github.com/pydata/xarray/pull/4979#issuecomment-789599056 https://api.github.com/repos/pydata/xarray/issues/4979 789599056 MDEyOklzc3VlQ29tbWVudDc4OTU5OTA1Ng== 10194086 2021-03-03T10:11:43Z 2021-03-03T10:11:43Z MEMBER

One thing I did not see discussed is alignment (or did I miss this?). Currently alignment is based on the "indexes" or well I guess pd.Index(dimension-coords). I assume not all potential indexes are useful for this? Alignment will still be based on 1D dimension-coords?

One (potential) edge case are MultiIndex which allow to align several non-dimension coordinates.

```python import xarray as xr da1 = xr.DataArray([1, 2, 3], dims="x", coords=dict(time=("x", [1, 2, 3]), exp=("x", ["a", "a", "b"]))) da2 = xr.DataArray([2, 3, 4], dims="x", coords=dict(time=("x", [1, 2, 3]), exp=("x", ["a", "a", "a"]))) da1 = da1.set_index(x=("time", "exp")) da2 = da2.set_index(x=("time", "exp")) da1 + da2 ``` ```python <xarray.DataArray (x: 2)> array([3, 5]) Coordinates: * x (x) MultiIndex - time (x) int64 1 2 - exp (x) object 'a' 'a' ```
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