issue_comments: 448474051

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https://github.com/pydata/xarray/issues/2619#issuecomment-448474051 https://api.github.com/repos/pydata/xarray/issues/2619 448474051 MDEyOklzc3VlQ29tbWVudDQ0ODQ3NDA1MQ== 1217238 2018-12-19T05:27:53Z 2018-12-19T05:27:53Z MEMBER

I agree, this is an xarray bug.

It seems that we need to drop unused levels in the MultiIndex as part of unstack(), by invoking pd.MultiIndex.remove_unused_levels().

 
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