html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
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(?).","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,713834297
https://github.com/pydata/xarray/issues/4482#issuecomment-702965721,https://api.github.com/repos/pydata/xarray/issues/4482,702965721,MDEyOklzc3VlQ29tbWVudDcwMjk2NTcyMQ==,10194086,2020-10-02T21:27:33Z,2020-10-02T21:27:33Z,MEMBER,"Yes that would be very helpful. This is used for the weighted operations:

https://github.com/pydata/xarray/blob/333e8dba55f0165ccadf18f2aaaee9257a4d716b/xarray/core/weighted.py#L129-L135

and it would be great if this could be done upstream. However, `dot` is implemented using `np.einsum` which is quite a gnarly beast.




","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,713834297