Control: retitle -1 pandas<->xarray data conversion issues
Control: affects -1 python3-xarray
After fixing the easy parts (see Salsa), there are 3 remaining issues:
- Datetime-with-timezone, categorical, python-string, and nullable
indices lose this dtype (becoming object dtype, keeping their values;
note that none of the nullable indices tested actually contain nulls)
when going from pandas to xarray.
- For datetime-with-timezone indices (but not the other cases with the
above issue), the values of the categorical column (but not all the
columns) are lost, replaced by NaNs. As the xarray object does not
display this column's values, I do not know which step this happens at.
*Possibly* related to the exception when *all* columns are nullable
reported in upstream https://github.com/pydata/xarray/issues/9661 .
- If the index contains duplicate values, each row gets repeated as many
times as there are rows with that index value, when going from xarray to
pandas. Not obviously known upstream.
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