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/3337#issuecomment-534593621,https://api.github.com/repos/pydata/xarray/issues/3337,534593621,MDEyOklzc3VlQ29tbWVudDUzNDU5MzYyMQ==,2448579,2019-09-24T14:47:17Z,2019-09-24T14:47:17Z,MEMBER,"@nbren12 I had a quick look at this on my commute this morning. 

1. Somehow `squeeze=True` when it is `False` in the `groupby` constructor. Not sure why.

2. For `squeeze=True`, the `Dataset` behaviour is correct since you're attempting to reduce along the grouped dimension which has been squeezed out. `DataArray` is incorrectly reducing all dimensions in each group (This was deprecated in 0.13)

I have partial fix in #3338 with a better error message but it needs tests and docs; and also a fix for `squeeze` being `True` by default. If you have time, can you finish that up?","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,497427114