issue_comments: 1236756285

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https://github.com/pydata/xarray/issues/6752#issuecomment-1236756285 https://api.github.com/repos/pydata/xarray/issues/6752 1236756285 IC_kwDOAMm_X85Jt2c9 4160723 2022-09-05T09:26:36Z 2022-09-05T09:26:36Z MEMBER

Thanks for the issue report @lukasbindreiter, I opened #6987. As a workaround, you could use Indexes.group_by_index(), which shouldn't have any hash issue and which might be better fitted for your use case.

Regarding (de)serialization (from)to netCDF or other formats, I wonder if building multi-indexes or other custom indexes when opening the dataset couldn't be done via some custom Xarray IO backend (https://docs.xarray.dev/en/stable/internals/how-to-add-new-backend.html). I'm not sure how easy / hard it is to implement a custom backend on top of an existing one, though. For the serialization, Xarray doesn't support custom writable backends (yet), but since multi-index levels are now real coordinates maybe a custom backend is not really needed. Right now Xarray raises NotImplementedError when trying to save a variable wrapping a multi-index, but probably we could just get rid of the multi-index "dimension" coordinate (tuple elements) and save level coordinates like any other variable.

 
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