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  • MultiIndex listed multiple times in Dataset.indexes property · 3 ✖

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  • CONTRIBUTOR · 3 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
1236917784 https://github.com/pydata/xarray/issues/6752#issuecomment-1236917784 https://api.github.com/repos/pydata/xarray/issues/6752 IC_kwDOAMm_X85Jud4Y lukasbindreiter 21131639 2022-09-05T12:07:13Z 2022-09-05T12:07:13Z CONTRIBUTOR

Thanks for the suggestions, I'll look into this Indexes.group_by_index and see if that is able to resolve our issue.

And with regards to the (de)serialization: I haven't investigated yet how the index changes in 2022.6 affect our initial usecase, maybe an approach such as the suggested with a custom backend may be even a better solution for us then. Though probably we would ideally need a way to override NetCDF4BackendEntrypoint with another Entrypoint as the default for .nc files

As for the original issue discussed here: That can probably be closed then, since it was an intentional change. But finding information about those changes right now was not so easy, is there some resource available where I can read up about the changes to indexes and functions related to them. (e.g. I was unaware of the existence of xindexes or Indexes.group_by_index)?

 
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   MultiIndex listed multiple times in Dataset.indexes property 1293460108
1236717180 https://github.com/pydata/xarray/issues/6752#issuecomment-1236717180 https://api.github.com/repos/pydata/xarray/issues/6752 IC_kwDOAMm_X85Jts58 lukasbindreiter 21131639 2022-09-05T08:51:24Z 2022-09-05T08:51:24Z CONTRIBUTOR

@benbovy I also just tested the get_unique() method that you mentioned and maybe noticed a related issue here, which I'm not sure is wanted / expected.

Taking the above dataset ds, accessing this function results in an error:

```python

ds.indexes.get_unique()

TypeError: unhashable type: 'MultiIndex' ```

However, for xindexes it works: ```python

ds.xindexes.get_unique()

[<xarray.core.indexes.PandasMultiIndex at 0x7f105bf1df20>] ```

 
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   MultiIndex listed multiple times in Dataset.indexes property 1293460108
1236714136 https://github.com/pydata/xarray/issues/6752#issuecomment-1236714136 https://api.github.com/repos/pydata/xarray/issues/6752 IC_kwDOAMm_X85JtsKY lukasbindreiter 21131639 2022-09-05T08:48:23Z 2022-09-05T08:48:23Z CONTRIBUTOR

We used the .indexes property to implement a workaround for serializing Datasets containing multiindices to netCDF. For this the implementation basically looked like this: (Inspired by and related to this issue: https://github.com/pydata/xarray/issues/1077)

Saving dataset as NetCDF: 1. Loop over dataset.indexes 2. Check if index is a multi index 3. If so, encode it somehow and save it as attribute in the dataset 4. Reset (remove) the index 5. Now save this "patched" dataset as NetCDF

And then loading it again: 1. Load the dataset 2. Check if this special attribute exists 3. If so decode the multiindex and set it as index in the dataset

When testing the pre-release version I noticed some of our tests failing, which is why I raised this issue in the first place - in case those changes were unwanted. I was not aware that you were actively working on multi index changes and therefore expecting API changes here. With that in mind I'll probably be able to adapt our code to this new API of indexes and xindexes.

 
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   MultiIndex listed multiple times in Dataset.indexes property 1293460108

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