issue_comments: 390278846

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https://github.com/pydata/xarray/issues/2160#issuecomment-390278846 https://api.github.com/repos/pydata/xarray/issues/2160 390278846 MDEyOklzc3VlQ29tbWVudDM5MDI3ODg0Ng== 1217238 2018-05-18T17:35:19Z 2018-05-18T17:35:19Z MEMBER

It looks like we were indeed creating a MultiIndex with duplicate level values in this case, which is probably not a great idea -- it's a slightly weird edge case in pandas' data model.

We should probably update the logic in our multiindex_from_product_levels() function to factorize levels if they aren't already unique.

 
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