issue_comments: 706140256

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https://github.com/pydata/xarray/issues/4482#issuecomment-706140256 https://api.github.com/repos/pydata/xarray/issues/4482 706140256 MDEyOklzc3VlQ29tbWVudDcwNjE0MDI1Ng== 10194086 2020-10-09T12:01:37Z 2020-10-09T12:01:37Z MEMBER

fillna is basically where(notnull(data), data, other). I think what takes the longest is the where part - possibly making a memory copy(?).

 
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