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id node_id number title user state locked assignee milestone comments created_at updated_at ▲ closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
1238783899 I_kwDOAMm_X85J1leb 6616 flox breaks multiindex groupby dcherian 2448579 closed 0     0 2022-05-17T15:05:00Z 2022-05-17T16:11:18Z 2022-05-17T16:11:18Z MEMBER      

What happened?

From @malmans2

``` python import numpy as np

import xarray as xr

ds = xr.Dataset( dict(a=(("z",), np.ones(10))), coords=dict(b=(("z"), np.arange(2).repeat(5)), c=(("z"), np.arange(5).repeat(2))), ).set_index(bc=["b", "c"]) grouped = ds.groupby("bc")

with xr.set_options(use_flox=False): grouped.sum() # OK

with xr.set_options(use_flox=True): grouped.sum() # Error ```

What did you expect to happen?

No response

Minimal Complete Verifiable Example

No response

MVCE confirmation

  • [ ] Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
  • [ ] Complete example — the example is self-contained, including all data and the text of any traceback.
  • [ ] Verifiable example — the example copy & pastes into an IPython prompt or Binder notebook, returning the result.
  • [ ] New issue — a search of GitHub Issues suggests this is not a duplicate.

Relevant log output

```Python ctests/test_xarray.py:329: in test_multi_index_groupby_sum actual = xarray_reduce(ds, "bc", func="sum") flox/xarray.py:374: in xarray_reduce actual[k] = v.expand_dims(missing_group_dims) ../xarray/xarray/core/dataset.py:1427: in setitem self.update({key: value}) ../xarray/xarray/core/dataset.py:4432: in update merge_result = dataset_update_method(self, other) ../xarray/xarray/core/merge.py:1070: in dataset_update_method return merge_core( ../xarray/xarray/core/merge.py:722: in merge_core aligned = deep_align( ../xarray/xarray/core/alignment.py:824: in deep_align aligned = align( ../xarray/xarray/core/alignment.py:761: in align aligner.align() ../xarray/xarray/core/alignment.py:550: in align self.assert_unindexed_dim_sizes_equal() ../xarray/xarray/core/alignment.py:450: in assert_unindexed_dim_sizes_equal raise ValueError( E ValueError: cannot reindex or align along dimension 'bc' because of conflicting dimension sizes: {10, 6} (note: an index is found along that dimension with size=10) ____ test_multi_index_groupby_sum[numpy] _______________________________ tests/test_xarray.py:329: in test_multi_index_groupby_sum actual = xarray_reduce(ds, "bc", func="sum") flox/xarray.py:374: in xarray_reduce actual[k] = v.expand_dims(missing_group_dims) ../xarray/xarray/core/dataset.py:1427: in __setitem self.update({key: value}) ../xarray/xarray/core/dataset.py:4432: in update merge_result = dataset_update_method(self, other) ../xarray/xarray/core/merge.py:1070: in dataset_update_method return merge_core( ../xarray/xarray/core/merge.py:722: in merge_core aligned = deep_align( ../xarray/xarray/core/alignment.py:824: in deep_align aligned = align( ../xarray/xarray/core/alignment.py:761: in align aligner.align() ../xarray/xarray/core/alignment.py:550: in align self.assert_unindexed_dim_sizes_equal() ../xarray/xarray/core/alignment.py:450: in assert_unindexed_dim_sizes_equal raise ValueError( E ValueError: cannot reindex or align along dimension 'bc' because of conflicting dimension sizes: {10, 6} (note: an index is found along that dimension with size=10)

Anything else we need to know?

No response

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   completed xarray 13221727 issue

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