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  • Regression: "ValueError: cannot unstack dimensions that do not have a MultiIndex" when unstacking a MultiIndex · 3 ✖

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849733928 https://github.com/pydata/xarray/issues/5384#issuecomment-849733928 https://api.github.com/repos/pydata/xarray/issues/5384 MDEyOklzc3VlQ29tbWVudDg0OTczMzkyOA== benbovy 4160723 2021-05-27T15:35:18Z 2021-05-27T15:35:18Z MEMBER

This should be fixed in #5385.

Side note: the example you gave here, i.e.,

python ds = Dataset({'d': DataArray(c.data, dims=['c'])}, coords=c.coords) ds = ds.unstack(['c'])

should probably be depreciated after the index refactoring in Xarray (currently WIP), which aims to decouple the concepts of coordinates vs. indexes. More specifically, indexes shouldn't be passed implicitly via the coords argument of the Dataset/DataArray constructors anymore, but instead explicitly via the indexes argument (see https://github.com/pydata/xarray/blob/master/design_notes/flexible_indexes_notes.md#22-explicit-vs-implicit-index-creation).

 
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   Regression: "ValueError: cannot unstack dimensions that do not have a MultiIndex" when unstacking a MultiIndex 903055859
849602816 https://github.com/pydata/xarray/issues/5384#issuecomment-849602816 https://api.github.com/repos/pydata/xarray/issues/5384 MDEyOklzc3VlQ29tbWVudDg0OTYwMjgxNg== benbovy 4160723 2021-05-27T12:44:08Z 2021-05-27T12:44:08Z MEMBER

This has been introduced in #5102. I'm looking into it.

 
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   Regression: "ValueError: cannot unstack dimensions that do not have a MultiIndex" when unstacking a MultiIndex 903055859
849246165 https://github.com/pydata/xarray/issues/5384#issuecomment-849246165 https://api.github.com/repos/pydata/xarray/issues/5384 MDEyOklzc3VlQ29tbWVudDg0OTI0NjE2NQ== max-sixty 5635139 2021-05-27T01:31:49Z 2021-05-27T01:32:18Z MEMBER

This does look like a bug, specifically affecting MultiIndexes containing only one Index.

The issue seems to be that self.get_index('c') returns a normal index:

```python 4020 non_multi_dims = [ 4021 d for d in dims if not isinstance(self.get_index(d), pd.MultiIndex) 4022 ] 4023 if non_multi_dims: -> 4024 raise ValueError( 4025 "cannot unstack dimensions that do not " 4026 f"have a MultiIndex: {non_multi_dims}" 4027 ) 4028 4029 result = self.copy(deep=False) 4030 for dim in dims:

ipdb> self.get_index('c') Index([(0,)], dtype='object') # <- single index

ipdb> self <xarray.Dataset> Dimensions: (c: 1) Coordinates: * c (c) MultiIndex # <- multi index - b (c) int64 0 a (c) int64 0 Data variables: d (c) int64 0 ```

I'm not sure how common it is for MultiIndexes to have a single index, but we should be general over any number.

We'd definitely take a fix for this. 

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   Regression: "ValueError: cannot unstack dimensions that do not have a MultiIndex" when unstacking a MultiIndex 903055859

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