`pandas.MultiIndex` roundtrip with extension-arrays
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- Dominant language
- Python
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Description
Is your feature request related to a problem?
In the following test
We encode that we expect extension arrays roundtripped with a MultiIndex as the dataframe index to be cast into numpy (broadcasting rules, if I remember correctly) but this should be relaxed to allow true roundtripping!
See https://github.com/pydata/xarray/pull/10559#discussion_r2239995709 for the originating discussion
Describe the solution you'd like
pandas.Dataframe with a MultiIndex and extension arrays in it should be roundtrippable without data type loss
Describe alternatives you've considered
N/A
Additional context
No response
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the linked test in xarray/tests/test_pandas_to_xarray.py at lines 159-176 and read the originating discussion in pull request 10559. Update the roundtrip expectations so a pandas DataFrame with a MultiIndex and extension arrays preserves its data types, then run the targeted pandas-to-xarray tests.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- pandas, python
- Domain
- data
- Issue type
- Feature
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 52/100