issue_comments: 925718593

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https://github.com/pydata/xarray/pull/5692#issuecomment-925718593 https://api.github.com/repos/pydata/xarray/issues/5692 925718593 IC_kwDOAMm_X843LVhB 4160723 2021-09-23T11:16:18Z 2021-09-23T11:16:18Z MEMBER

In the last commits I refactored stack / unstack.

One change is that a multi-index is not always created with stack. It is created only if each of the dimensions to stack together have one and only one coordinate with a pandas index (this could be a non-dimension coordinate).

This could maybe address #5202, since we could simply drop the indexes before stacking the dimensions in order to avoid the creation of a multi-index. I don't think it's a big breaking change either unless there are users who rely on default multi-indexes with range (0, 1, 2...) levels. Looking at #5202, however, those default multi-indexes seem more problematic than something really useful, but I might be wrong here. Also, range-based indexes can still be created explicitly before stacking the dimensions if needed.

Another consequence is that stack is not always reversible, since unstack still requires a pandas multi-index (one and only one multi-index per dimension to unstack).

 
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