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  • string coords are converted to object dtype when using MultiIndex / stacking · 5 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
1259415933 https://github.com/pydata/xarray/issues/2280#issuecomment-1259415933 https://api.github.com/repos/pydata/xarray/issues/2280 IC_kwDOAMm_X85LESl9 benbovy 4160723 2022-09-27T12:12:05Z 2022-09-27T12:12:05Z MEMBER

This is fixed in v2022.6.0. Xarray's PandasMultiIndex wrapper keeps track of the level coordinate dtypes.

 
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   string coords are converted to object dtype when using MultiIndex / stacking 340316108
469854461 https://github.com/pydata/xarray/issues/2280#issuecomment-469854461 https://api.github.com/repos/pydata/xarray/issues/2280 MDEyOklzc3VlQ29tbWVudDQ2OTg1NDQ2MQ== max-sixty 5635139 2019-03-05T20:58:08Z 2019-03-05T20:58:08Z MEMBER 
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   string coords are converted to object dtype when using MultiIndex / stacking 340316108
469848471 https://github.com/pydata/xarray/issues/2280#issuecomment-469848471 https://api.github.com/repos/pydata/xarray/issues/2280 MDEyOklzc3VlQ29tbWVudDQ2OTg0ODQ3MQ== shoyer 1217238 2019-03-05T20:39:50Z 2019-03-05T20:39:50Z MEMBER

@max-sixty this is #2280 :)

 
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   string coords are converted to object dtype when using MultiIndex / stacking 340316108
469846746 https://github.com/pydata/xarray/issues/2280#issuecomment-469846746 https://api.github.com/repos/pydata/xarray/issues/2280 MDEyOklzc3VlQ29tbWVudDQ2OTg0Njc0Ng== max-sixty 5635139 2019-03-05T20:34:26Z 2019-03-05T20:34:26Z MEMBER 
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   string coords are converted to object dtype when using MultiIndex / stacking 340316108
406451785 https://github.com/pydata/xarray/issues/2280#issuecomment-406451785 https://api.github.com/repos/pydata/xarray/issues/2280 MDEyOklzc3VlQ29tbWVudDQwNjQ1MTc4NQ== shoyer 1217238 2018-07-20T00:17:31Z 2018-07-20T00:17:31Z MEMBER

Hi @ctw, thanks for raising this issue.

I think we'll be able to fix this eventually, but not until the large refactor envisioned by https://github.com/pydata/xarray/issues/1603.

With the current version of xarray's data model this is basically unavoidable, because pandas.MultiIndex objects hold strings in dtype=object arrays.

 
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   string coords are converted to object dtype when using MultiIndex / stacking 340316108

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