issue_comments: 692574610

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https://github.com/pydata/xarray/issues/3570#issuecomment-692574610 https://api.github.com/repos/pydata/xarray/issues/3570 692574610 MDEyOklzc3VlQ29tbWVudDY5MjU3NDYxMA== 10194086 2020-09-15T08:59:49Z 2020-09-15T09:58:49Z MEMBER

The problem is that xarray calls where(isnull(data), data, other) for all variables. It also uses dataset_join="left", thus other is NaN for all DataArrays that are not passed... I think fillna should be made a no-op if notnull(data).any()

https://github.com/pydata/xarray/blob/66ab0ae4f3aa3c461357a5a895405e81357796b1/xarray/core/duck_array_ops.py#L284-L288

A possible workaround is to use da.fillna(value={"A": 0, "C": True})

 
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