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  • pandas-0.23 breaks stack with duplicated indices · 3 ✖

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391041677 https://github.com/pydata/xarray/issues/2160#issuecomment-391041677 https://api.github.com/repos/pydata/xarray/issues/2160 MDEyOklzc3VlQ29tbWVudDM5MTA0MTY3Nw== shoyer 1217238 2018-05-22T15:48:13Z 2018-05-22T15:48:13Z MEMBER 
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   pandas-0.23 breaks stack with duplicated indices  324409064
390278846 https://github.com/pydata/xarray/issues/2160#issuecomment-390278846 https://api.github.com/repos/pydata/xarray/issues/2160 MDEyOklzc3VlQ29tbWVudDM5MDI3ODg0Ng== shoyer 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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   pandas-0.23 breaks stack with duplicated indices  324409064
390241672 https://github.com/pydata/xarray/issues/2160#issuecomment-390241672 https://api.github.com/repos/pydata/xarray/issues/2160 MDEyOklzc3VlQ29tbWVudDM5MDI0MTY3Mg== jhamman 2443309 2018-05-18T15:20:55Z 2018-05-18T15:20:55Z MEMBER

See also #1499. I don't think we have any tests for duplicate dimensions in xarray so I'm not surprised this has stopped working. 

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   pandas-0.23 breaks stack with duplicated indices  324409064

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