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/1117#issuecomment-260381185,https://api.github.com/repos/pydata/xarray/issues/1117,260381185,MDEyOklzc3VlQ29tbWVudDI2MDM4MTE4NQ==,1217238,2016-11-14T16:17:32Z,2016-11-14T16:17:32Z,MEMBER,"I'm afraid this is not possible. You'll need to write out a new file on disk if you want to do this sort of thing with xarray.

This was an intentional choice -- maintaining the consistency of a netCDF file in each incremental Dataset operation (especially more complex operations like adding a variable) is a good deal more complex than updating xarray's internal data structures in Python.
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