issue_comments: 708474940

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https://github.com/pydata/xarray/issues/4482#issuecomment-708474940 https://api.github.com/repos/pydata/xarray/issues/4482 708474940 MDEyOklzc3VlQ29tbWVudDcwODQ3NDk0MA== 2560426 2020-10-14T15:21:29Z 2020-10-14T15:21:55Z NONE

Adding on, whatever the solution is that avoids blowing up memory, especially when using with construct, it would be useful to be implemented for both fillna(0) and notnull(). One common use-case would be so that you can take a weighted mean which normalizes by the sum of weights corresponding only to non-null entries, as in here: https://github.com/pydata/xarray/blob/333e8dba55f0165ccadf18f2aaaee9257a4d716b/xarray/core/weighted.py#L169

 
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