Concat with multiindex

[roberthannah89]

What happened?

a = xr.concat([xr.DataArray(i) for i in [1,2,3]], pd.MultiIndex.from_tuples([('A', 'x'), ('B', 'y'), ('C', 'z')], names=['Group', 'Letter'])) xr.concat([a,a], 'D')

This should be fine but fails with

ValueError: cannot re-index or align objects with conflicting indexes found for the following dimensions: 'concat_dim' (2 conflicting indexes)

Conflicting indexes may occur when

• they relate to different sets of coordinate and/or dimension names

• they don't have the same type

• they may be used to reindex data along common dimensions

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.
• [ ] Recent environment — the issue occurs with the latest version of xarray and its dependencies.

Relevant log output

No response

Anything else we need to know?

No response

Environment

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