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  • Same files in open_mfdataset() unclear error message · 2 ✖

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828596025 https://github.com/pydata/xarray/issues/5230#issuecomment-828596025 https://api.github.com/repos/pydata/xarray/issues/5230 MDEyOklzc3VlQ29tbWVudDgyODU5NjAyNQ== TomNicholas 35968931 2021-04-28T16:28:50Z 2021-04-28T16:29:34Z MEMBER

Okay so I found the problem. If you also pass combine='nested' then it should work - that's what you're supposed to do to open your two datasets.

We currently get an unhelpful error because the default argument combine='by_coords' should be incompatible with passing any value for concat_dim (because the function combine_by_coords doesn't accept any concat_dim argument), but right now that possibility is not checked in any way (it used to be, but got lost in a deprecation cycle...)

To fix this I would simply add an input check that raises an error like "passing a value for concat_dim can only be used with combine='nested', not combine='by_coords'"

 
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   Same files in open_mfdataset() unclear error message 869948050
828529986 https://github.com/pydata/xarray/issues/5230#issuecomment-828529986 https://api.github.com/repos/pydata/xarray/issues/5230 MDEyOklzc3VlQ29tbWVudDgyODUyOTk4Ng== TomNicholas 35968931 2021-04-28T15:03:24Z 2021-04-28T15:03:24Z MEMBER

Thanks for reporting this @antscloud - the error is from the combine_by_coords function that can be used inside open_mfdataset, but I think something in the logic has gone wrong to give you this particularly unhelpful error. I'll have a look now

 
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   Same files in open_mfdataset() unclear error message 869948050

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